Sports · Part Five · The Whole Athlete and the Team

62THE TEAM

Lesson 62 / 64

Working With the Team

Elite care is never solo; the athlete is served by a team that thinks as one nervous system.

Working with the team is co-management: the chiropractor works as a peer inside a sports medicine staff alongside the athletic trainer, the team physician, the strength coach and the specialists. Each holds a different instrument, and the skill is matching the athlete's need to the right one. The Unified Model of Tone reads that staff as one axis of magnitude rather than a ranking.

Staff structure

Inter-association consensus

Field point person

Certified athletic trainer

Full-time AT in schools

37 percent

Clinicians pressured

64.4 percent

Co-management.

Two or more clinicians sharing responsibility for one athlete under a written agreement about who evaluates what, who decides what, and how findings move between them.

Magnitude matching.

Choosing the size of an input to fit what the athlete can currently use. A light input that fails costs little. A distortion beyond its reach needs the larger input, and delay is its own harm.

01What the surveys show

The Numbers Behind Team Care

Eight findings on how sports medicine staffs are structured, and where coordination holds or gives way.

37 percent full time
Of 8,509 public secondary schools responding to a national survey, 70 percent had athletic training services, and only 37 percent had them full time, Pryor 2015. The field point person every protocol assumes is not universally present, so the staff structure has to be built rather than inherited.
86 percent of athletes
The same survey found that 86 percent of athletes, 2,394,284 of 2,787,595, had access to athletic training services, while 48 percent of schools provided coverage at all practices, Pryor 2015. Access to a clinician and coverage of the actual training week are two different numbers.
64.4 percent pressured
Among 789 athletic trainers and 111 team physicians at 530 colleges, 64.4 percent reported pressure from athletes to clear a concussed player early, and 53.7 percent reported it from coaches, Kroshus 2015. Only 6.6 percent reported that pressure from another clinician.
The reporting line mattered
In that survey, clinicians reported greater pressure from coaches when their sports medicine department answered to the athletic department rather than to a medical institution, Kroshus 2015. Who the staff reports to is a clinical variable, not an administrative detail.
Twenty-three documents in
The team physician consensus series runs to 23 annual documents, written by a project-based alliance of six professional associations, Herring 2024. The role is defined by agreement across societies rather than claimed by any one of them.
Availability predicted success
Screening 10,546 titles and including 14 studies, a systematic review found strong evidence that greater availability of team members lowered the risk of competitive failure, Drew 2017. Keeping athletes available is the outcome every seat on the staff is coordinating toward.
750 service members
A three-site pragmatic trial added chiropractic care to usual medical care for 750 active-duty service members with low back pain, Goertz 2018. At six weeks the adjusted mean difference favored the combined arm by 1.1 points for pain intensity and 2.2 points for disability.
Trust rose over 18 months
When a chiropractor joined two community health center teams, the 12 providers followed for 18 months grew more willing to trust chiropractors in shared care, Garner 2008. Ratings of legitimacy and effectiveness both rose, at P less than .001.

02The roster around one athlete

A Sports Medicine Staff Is a Roster of Distinct Specialists

Elite athletic care is delivered by a multidisciplinary staff coordinating around one athlete, and knowing every role on it is the price of admission. The acute sideline group is the certified athletic trainer, the team physician, family and orthopedic physicians, the strength and conditioning coach holding the CSCS, and local emergency medical services. The non-acute circle adds physical therapists, chiropractors, neurologists, podiatrists, mental health specialists, and performance coaches.

Each professional owns a skill set the others do not hold. That is why the structure is written down rather than improvised. Sixteen authors drawn from eleven national associations produced the inter-association consensus statement on best practices for sports medicine management in secondary schools and colleges Courson 2014. Athletic training, athletic administration, pediatrics, orthopedic sports medicine and collegiate athletics all signed the same document.

The team physician role is defined by agreement, not by claim

The team physician consensus series has now reached 23 annual documents, produced by a project-based alliance of six professional associations Herring 2024. Its most recent update delineates the qualifications, duties and responsibilities of the team physician, and offers organizations guidance on selecting one Herring 2025. The document states plainly that it is a guide rather than a standard of care.

Read that structure carefully, because it settles the tone of everything that follows. No profession granted itself its place on the staff. Each role was defined in a document other professions helped write. A chiropractor entering that roster enters a defined seat, and command of the whole roster is what earns it.

An explicit hierarchy of responsibility, and what it is not

Responsibility on a sports medicine staff is arranged explicitly, so that nobody hesitates in the seconds when hesitation costs. Everyone knows who directs medical decisions, who runs the sideline, and who to call when a question arises. The emergency version of that chain, including the action plan and the roles inside it, belongs to Emergency and Field Procedures.

A hierarchy of responsibility is not a ranking of professions. It answers one question, which is who holds the decision in this moment for this athlete. The strength coach holds the training decision. The team physician holds the medical clearance. The athletic trainer holds the field. None of these is subordinate. They are coordinated.

03Who leads the sideline

The Certified Athletic Trainer Is the Point Person on the Field

On the field of play the certified athletic trainer (ATC) is the point person, the primary health care professional present before, during and after the contest. The athletic trainer sees the whole field, the whole athlete and the whole team, often both teams. They know the athlete before the injury, they evaluate fresh in the golden moment when the picture is clearest, and they manage the sideline plan under a physician director.

That coverage is neither universal nor cheap. Across 8,509 responding public secondary schools, 70 percent had athletic training services and 37 percent had a full-time athletic trainer Pryor 2015. Coverage at every practice reached 48 percent of schools. Eighty-six percent of athletes had access to athletic training services, which leaves more than 390,000 who did not.

Learning the chain of command is professional competence

A chiropractor who works with a team learns the chain of command, communicates findings cleanly, and integrates into the existing flow rather than disrupting it. Respecting that structure is professionalism. The athletic trainer who comes to trust a chiropractor opens the door to elite work, and that trust is built on competence and clear communication.

Trust of that kind is measurable and it accrues slowly. When a chiropractor was introduced into two community health center teams, the 12 physicians, nurse practitioners and nurses followed across 18 months became more willing to share care Garner 2008. Their ratings of the legitimacy and the effectiveness of chiropractic both rose, each at P less than .001.

The athlete is the one who benefits when the staff moves as a single coordinated unit. Nothing about that arrangement asks a chiropractor to be quiet. It asks every clinician to route their findings to the person holding the next decision.

04What the chiropractor brings

The Adjustment and the Neurological Read Are What the Staff Cannot Duplicate

The first question any professional coach asks is what you can do for this athlete, and the answer has to be specific. The chiropractor brings elite diagnostic skill and mastery of the spinal and extremity adjustment, which is genuinely the chiropractic specialty and the one intervention nobody else on staff duplicates. Nutrition, soft tissue work and active release can all be delivered by others.

The precision adjustment, and the performance neurology behind it, is the differentiator. Restoring joint motion feeds clean proprioceptive and joint position sense signal to the brain, which sharpens the closed loop that governs coordination. The receptor evidence sits on Proprioception and Joint Position Sense and the measured change in cortical drive sits on Cortical Drive and Force.

Command of the craft outranks the credentials on a wall

A clinician who diagnoses sharply and adjusts with precision becomes useful to a staff on the first week. The offer is targeted neurological tuning rather than a generic wellness service, and it is drug free, which keeps it clean against the testing calendar. Anti-doping obligations and the documentation that proves compliance belong to The Medical-Legal Standard.

Adding that instrument to an existing medical service has been tested directly. A three-site pragmatic trial allocated 750 active-duty service members with low back pain to usual medical care plus chiropractic care or usual medical care alone Goertz 2018. At six weeks the adjusted mean differences favored the combined arm by 1.1 points on an 11-point pain scale and 2.2 points on a 24-point disability scale.

The design is the part that matters here. Nobody was asked to choose between professions. Chiropractic care was added to usual medical care, inside military treatment facilities, with the medical service continuing throughout. That is co-management as a study design, and satisfaction favored the combined arm by 2.5 points.

05Where coordination gives way

Team Care Fails at the Handoff Rather Than at the Skill Level

The common failure on a performance staff is not incompetence. It is that four competent people hold four private pictures of the same athlete. Sports medicine physicians working with elite competitors have described the standard delivery model as a reductionist multispecialist system that lacks an integrated approach and effective communication in practice Dijkstra 2014.

The same authors name the specific breakdown. An athlete and a coach, alone or with one member of the support team who is often not qualified to make the call, decide which services get used and how the recommendations get applied. Their answer was the Integrated Performance Health Management and Coaching model, built at UK Athletics ahead of the London Olympic and Paralympic Games.

That model puts the medical team and the coaching team under experienced leadership, working toward a shared performance goal, accountable to a performance director and ultimately to a board. The point is governance rather than goodwill. Coordination that depends on individuals liking each other collapses the first time the calendar tightens.

The reporting line changes what clinicians feel free to say

Governance is measurable, and it shows up in the hardest decisions. A survey of 789 athletic trainers and 111 team physicians across 530 institutions found that 64.4 percent had felt pressure from athletes to clear a concussed player before they were ready Kroshus 2015. From coaches the figure was 53.7 percent. From other clinicians it was 6.6 percent.

Read the last number against the first two. Pressure to shortcut a decision came from outside the clinical group almost entirely. Clinicians also reported more pressure from coaches when their department reported to the athletic department instead of a medical institution. Concussion criteria themselves belong to Concussion, and the clearance framework to Return to Play.

Data collected separately is data that goes unused

The instruments are already on site and the integration is what lags. A survey of high-level football clubs asked practitioners what blocked effective monitoring Akenhead 2016. Limited human resources ranked highest, followed by coach buy-in, and the authors traced the shortfall to suboptimal integration with coaching staff. The full monitoring numbers are carried by Tone and the Athlete's Edge.

Coordination itself has been trialed, and the trial evidence is thin. A Cochrane review of practice-based interprofessional collaboration found nine randomized studies covering 6,540 participants, too heterogeneous to pool Reeves 2017. Adherence to recommended practices and use of health care resources may be slightly improved, both at low certainty, and no study reported mortality or complication rates.

That is a frontier rather than a verdict. Nobody has yet run the study that measures whether a shared record of an athlete's readouts outperforms four separate records, which is precisely the study this page argues for below.

06Writing the pathway down

A Co-Management Agreement Is a Document, Not a Handshake

Co-management works when it is written. The clearest published template comes from the Department of Veterans Affairs, where a modified Delphi process put a chiropractic integrated care pathway to 58 panelists Lisi 2018. Ninety-three percent of the seed statements reached consensus in the first round, and all of them did after two.

What that pathway specifies is the useful part for a performance staff. It covers informed consent, history and examination, red-flag screening, documentation, diagnostic imaging, patient-reported outcomes, adverse event reporting, and treatment frequency and duration. It also sets algorithms for when the chiropractor refers and when the primary care or mental health clinician takes the lead.

A performance staff needs the same six answers. Who evaluates what. Who holds which decision. What gets recorded and where. When care escalates. When it steps back down. Who tells the athlete. Documentation standards and the medical-legal duties behind them belong to The Medical-Legal Standard.

Referral is instrument selection, and the profession has room to improve at it

Chiropractic co-management habits have been surveyed, and the picture is honest rather than flattering. Among 57 doctors of chiropractic responding to a 53-item survey, the highest levels of co-management were with family physicians, physical therapists and massage therapists Salsbury 2019. Referrals went most often to neurologists, family physicians, massage therapists and orthopedists.

The same survey scored respondents low on learning from other paradigms. Seventy-seven percent said an older patient with back pain would improve most if their chiropractor collaborated with a second chiropractor rather than with a medical professional. Ninety-two percent were confident managing that patient themselves. Confidence and collaboration were not moving together.

This practice answers that with the written pathway and the early referral. Sending an athlete to the team physician, the surgeon or the emergency department is instrument selection, and it costs nothing in standing. A distortion that has descended past what a surface input can reach needs the larger input, and delay becomes its own kind of harm.

07Continuity across a season

The Clinician Who Sees the Athlete Weekly Catches the Drift First

Working with a team is demanding, and the clinicians who do it choose it because they love the work. Early starts, a roster to see before a full clinic day, travel through a competitive calendar. The prestige is real and it is secondary to the service.

The reward is the work itself, and the shared goal is to keep the athlete coordinated, resilient and ready across a brutal calendar. That goal is measurable at the squad level. A systematic review that screened 10,546 titles and included 14 studies found strong evidence that greater availability of team members lowered the risk of competitive failure Drew 2017.

Injuries carried both before and during competition raised the risk of failure in the same review. Availability is the outcome the whole staff is protecting, which is why continuity of contact is worth arguing for on its own terms.

What weekly contact buys that episodic contact cannot

Continuity is the advantage. The clinician who sees the athlete every week catches the small drift before it becomes the injury. Weekly contact turns a single reading into a trend, and a trend is what an individual baseline is made of. Population reference ranges cannot do that job for an elite competitor.

A chiropractor embedded with a team monitors the athlete across the season, watching for the dysfunction that erodes autonomic regulation and recovery. The model expects that erosion to show in the structure of a measure before it shows in a stat line, and Heart Rate Variability carries the variability evidence in full. Training load and the workload ratios built on it belong to Injury Prevention and Load Management.

One athlete, one plan

The best sports medicine is integrated, where every provider sees the same athlete through a different lens and the lenses are aligned. The athletic trainer manages load and rehabilitation. The physician holds medical decisions and clearance. The strength coach builds capacity. The chiropractor tunes the nervous system that all three are already acting through.

Performance neurology gives that clinician a unifying view, because coordination, recovery and resilience are all expressions of the athlete's central integrative state, the readiness the whole staff is trying to protect. Spoken fluently, that language gives the staff someone who connects the joint to the brain to the autonomic state to the performance on the field.

One athlete, one plan, many specialists thinking as one. A chiropractor earns a place on an elite staff the way every good teammate does. Be undeniably good at the one thing nobody else can do, and communicate cleanly with everyone who shares the athlete.

08What we corrected

Three Claims Removed From This Page

The gold pull quote this page carried was presented as Dr. Jason Dulberg speaking, and no record of him saying or writing it exists. It is gone. The idea inside it survives above as the page's own statement about what earns a clinician a seat.

The page also described provider chiropractors logging on-site mornings from before dawn and traveling one week in four across a season. Those specifics could not be traced to any record, so they are gone. What replaced them is the availability finding, where greater availability of team members lowered the risk of competitive failure Drew 2017.

The third removal is a benefit claim. The page asserted that weekly care keeps an athlete coordinated and ready across a season, and that it catches erosion of autonomic regulation before that erosion reaches a stat line. No trial has tested continuity of care against a season outcome. That expectation is now stated as the model's, with the measurement that would show it named below.

09The model's claim

A Performance Staff Is One Axis of Magnitude Rather Than a Ranking

Two layers run through this page. The first belongs to the investigators cited above. They produced the athletic training coverage figures, the pressure percentages and their link to the reporting line, and the Delphi pathway. They also ran the co-management trial in military treatment facilities and the Cochrane review that found collaboration itself thinly trialed.

The second layer is the Unified Model of Tone, and its job here is arrangement. It puts every intervention on that staff, from the lightest sustained touch to the most invasive surgery, on one continuous axis of magnitude. In the model's own words, it does not rank these interventions, and it never counsels anyone to decline care they need.

Each referral then asks one question. Does the magnitude of this input match what this athlete, right now, can use? That is the same question the athletic trainer asks before sending a player to the physician, and the same question the physician asks before consulting the surgeon. The staff is a set of instruments at different magnitudes rather than a ladder with a top.

The prediction this page makes

The model treats the readouts different staff members already collect as views of one regulatory state rather than four independent scores. That is a claim about how performance is organized rather than a claim about what treatment does, and one season of ordinary team data can settle it.

Take one squad and change nothing about who collects what. The sport scientist keeps RMSSD. The clinician keeps joint position sense error in degrees. The performance coach keeps reaction time variability. The medical staff keeps time to return to baseline after a standardized load test. Put all four in one shared record, dated, per athlete.

Then run the factor analysis the four separate spreadsheets have never allowed. The prediction is specific: the four columns will load onto one factor within athlete, and a staff reading one shared record will see a change earlier than four staff reading four private ones. The methods page for that battery is The Functional Neurology Workup.

If RMSSD, joint position sense error in degrees, reaction time variability and time to return to baseline are shown to move together within the same athletes across a season, the unification claim is confirmed.

10The tone reading

Coupling, Handoff and Time Course Across a Performance Staff

Three signatures of tone show up in how a performance staff works, each in something the staff already records.

Coupling

Four staff members record four numbers on one athlete. The model reads them as coupled views of one state, so they should move together.

Input quality

A finding is only as good as its handoff. 64.4 percent of clinicians felt pressure to clear early, and almost none of it came from colleagues.

Time course

Weekly contact turns one reading into a trend. Episodic contact leaves a staff comparing an athlete to a population instead of to their own baseline.

The other foundations of tone show up in the same room. Load is the training week the staff is dosing between them, and constraint is the failure at both ends, a staff that escalates every finding and a staff where nobody holds the decision. Gain is how hard the plan swings when one number moves, which is why a single flagged reading should change the week rather than the season. Set-point is the athlete's own baseline, the thing a shared record exists to defend. Prediction is the staff working forward toward availability instead of backward from injury. Oscillation is the rhythm the calendar imposes, the weekly cycle of training, contest and recovery every seat is timing against. The framework itself is set out in the Unified Model of Tone.

11Where this sits

How This Page Relates to the Rest of the Library

Seven places the co-management argument continues, each with the claim that earns the link.

The Medical-Legal Standard

Carries scope of practice, documentation standards and anti-doping compliance, which are the written half of any co-management agreement.

Return to Play

Holds the clearance frameworks and the reinjury figures when criteria are skipped, which is the decision this page keeps inside the clinical group.

Emergency and Field Procedures

The emergency action plan and the roles inside it, where the chain of responsibility is executed in seconds.

Care at the Highest Level

What the standard of elite care actually is, and where professional sport already places chiropractic on staff.

The Performance Assessment

The visit where the four readouts get recorded together, which is what a shared record needs from the clinician.

Injury Prevention and Load Management

Owns the workload ratio evidence and its critiques, the numbers the strength staff brings to the same table.

Tone and the Athlete's Edge

The keystone lesson, where the one-variable claim behind the shared record is stated in full and given its study design.

12Questions athletes ask

Questions Athletes Ask

Why is a chiropractor part of an elite sports medicine team?

Because the precision spinal and extremity adjustment, and the neurological read behind it, is the one thing on the staff nobody else duplicates. Nutrition, soft tissue work and rehabilitation exercise can all be delivered by other clinicians in the room. Restoring joint motion changes the quality of proprioceptive and joint position sense signal reaching the brain, which is the loop that governs coordination. The care is also drug free, which keeps it clean against a testing calendar. That combination is why the seat exists on an integrated staff.

Who is in charge on the sideline?

The certified athletic trainer is the point person on the field, working under a physician director. They are present before, during and after the contest, they know the athlete before the injury, and they evaluate fresh in the golden moment when the picture is clearest. The team physician holds medical decisions and clearance. A chiropractor working with a team learns that chain of command and routes findings to whoever holds the next decision. Responsibility is arranged explicitly so nobody hesitates when hesitation costs.

Does a hierarchy of responsibility mean one profession outranks another?

No. It answers a different question, which is who holds this decision for this athlete in this moment. The strength coach holds the training decision, the physician holds medical clearance, the athletic trainer holds the field, and the chiropractor holds the adjustment and the neurological read. The Unified Model of Tone reads that staff as one continuous axis of magnitude running from the lightest input to surgery. The model does not rank those interventions. It asks whether the magnitude of each one matches what the athlete can currently use.

How should a sports chiropractor communicate with the team physician and athletic trainer?

In writing, early, and in the terms the next clinician needs. The clearest published template is the chiropractic integrated care pathway built for Veterans Affairs facilities, where 58 panelists reached consensus on 93 percent of the statements in a single round. It specifies consent, examination, red-flag screening, documentation, imaging, outcome measures, adverse event reporting and referral algorithms. A performance staff needs the same answers: who evaluates what, who decides what, what gets recorded, and when care escalates.

Is referring an athlete out a sign that chiropractic care did not work?

No. Referral is instrument selection. Every intervention available to a performance staff sits on one axis of magnitude, and the working question is whether the size of the input matches what the athlete can use right now. A light input that does not help has cost the athlete little and told the clinician something. When a problem sits past the reach of any surface input, the larger magnitude is the correct one, and delay becomes its own kind of harm. Nothing about that reflects on the profession.

What does the evidence say about co-managed care?

It has been tested directly. A three-site pragmatic trial gave 750 active-duty service members with low back pain either usual medical care alone or usual medical care plus chiropractic care. At six weeks the combined arm was favored by 1.1 points on pain intensity and 2.2 points on disability. Trials of collaboration itself are thinner. A Cochrane review of nine randomized studies covering 6,540 participants graded the evidence low to very low, so how best to coordinate a staff is still an open measurement problem.

What would prove that a shared record beats separate ones?

A season of ordinary team data. The sport scientist keeps RMSSD and the clinician keeps joint position sense error in degrees. The performance coach keeps reaction time variability, and the medical staff keeps time to return to baseline after a load test. Put all four in one dated record per athlete and run the factor analysis. The Unified Model of Tone predicts those four columns load onto one factor within athlete, which would mean four private spreadsheets are throwing away the signal they share.

13The sources

References

1
Herring SA, Putukian M, LeClere LE, Bennett C, Boyajian-O'Neill L, Carter D, Chang CJ, Day C, Day MA, Economopoulos K, Franks RR, Finnoff JT, Halstead M, Magnes SA, Matuszak J. The Team Physician Consensus Statement 2024 Update. Curr Sports Med Rep. 2025. PMID 40323056
2
Herring SA, Kibler WB, Putukian M, Boyajian-O'Neill LA, Chang CJ, Franks RR, Hutchinson M, Indelicato PA, O'Connor FG, Powell A, Roach R, Safran M, Statuta SM, Sutton K. Initial Assessment and Management of Select Musculoskeletal Injuries: A Team Physician Consensus Statement. Med Sci Sports Exerc. 2024. PMID 37847756
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Courson R, Goldenberg M, Adams KG, Anderson SA, Colgate B, Cooper L, Dewald L, Floyd RT, Gregory DB, Indelicato PA, Klossner D, O'Leary R, Ray T, Selgo T, Thompson C, Turbak G. Inter-association consensus statement on best practices for sports medicine management for secondary schools and colleges. J Athl Train. 2014. PMID 24499040
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Pryor RR, Casa DJ, Vandermark LW, Stearns RL, Attanasio SM, Fontaine GJ, Wafer AM. Athletic training services in public secondary schools: a benchmark study. J Athl Train. 2015. PMID 25689559
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Kroshus E, Baugh CM, Daneshvar DH, Stamm JM, Laursen RM, Austin SB. Pressure on Sports Medicine Clinicians to Prematurely Return Collegiate Athletes to Play After Concussion. J Athl Train. 2015. PMID 26207440
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Dijkstra HP, Pollock N, Chakraverty R, Alonso JM. Managing the health of the elite athlete: a new integrated performance health management and coaching model. Br J Sports Med. 2014. PMID 24620040
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Drew MK, Raysmith BP, Charlton PC. Injuries impair the chance of successful performance by sportspeople: a systematic review. Br J Sports Med. 2017. PMID 28446456
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Akenhead R, Nassis GP. Training Load and Player Monitoring in High-Level Football: Current Practice and Perceptions. Int J Sports Physiol Perform. 2016. PMID 26456711
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Goertz CM, Long CR, Vining RD, Pohlman KA, Walter J, Coulter I. Effect of Usual Medical Care Plus Chiropractic Care vs Usual Medical Care Alone on Pain and Disability Among US Service Members With Low Back Pain: A Comparative Effectiveness Clinical Trial. JAMA Netw Open. 2018. PMID 30646047
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Lisi AJ, Salsbury SA, Hawk C, Vining RD, Wallace RB, Branson R, Long CR, Burgo-Black AL, Goertz CM. Chiropractic Integrated Care Pathway for Low Back Pain in Veterans: Results of a Delphi Consensus Process. J Manipulative Physiol Ther. 2018. PMID 29482827
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Salsbury SA, Vining RD, Hondras MA, Wallace RB, Lyons KJ, Killinger LZ, Goertz CM. Interprofessional Attitudes and Interdisciplinary Practices for Older Adults With Back Pain Among Doctors of Chiropractic: A Descriptive Survey. J Manipulative Physiol Ther. 2019. PMID 31257002
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Garner MJ, Birmingham M, Aker P, Moher D, Balon J, Keenan D, Manga P. Developing integrative primary healthcare delivery: adding a chiropractor to the team. Explore (NY). 2008. PMID 18194787
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Reeves S, Pelone F, Harrison R, Goldman J, Zwarenstein M. Interprofessional collaboration to improve professional practice and healthcare outcomes. Cochrane Database Syst Rev. 2017. PMID 28639262

13 primary sources, each linked to its record. Figures quoted on this page were checked against the published abstract.

Related evidence

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