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Teaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia [email protected]
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Page 1: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Teaching Quality Improvement

Linda A. Headrick, M.D., M.S.University of [email protected]

Page 2: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

How do we graduate physicians able and expecting to

improve care?

Page 3: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Foundation Concepts,

Skills & Values

Limited Applications

Expanded Applications

DemonstratedBasic

Competency

BeginningMedical Student

AdvancedMedical Student

BeginningResident

AdvancedResident

Educating a Physician Able andExpecting to Improve Care

Page 4: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Key Questions

• What should we teach?

• How should we teach?

• How will we measure the results?

Page 5: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Key Questions

• What should we teach?

• How should we teach?

• How will we measure the results?

Page 6: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Core Content Areas• Knowledge of the needs and preferences

of those we serve (“customer knowledge”)• Health care as a process, system• Variation and measurement• Leading, following and making changes in

health care• Collaboration• Developing new locally useful knowledge• Social context & accountability• Professional subject matter IHI 1998

Page 7: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Core Content Areas• Knowledge of the needs and preferences

of those we serve (“customer knowledge”)• Health care as a process, system• Variation and measurement• Leading, following and making changes in

health care• Collaboration• Developing new locally useful knowledge• Social context & accountability• Professional subject matter IHI 1998

Page 8: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Key Questions

• What should we teach?

• How should we teach?

• How will we measure the results?

Page 9: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Key Principles Informing Teaching Methods

• Professional knowledge must be combined with knowledge for improvement.

• It is helpful to combine didactic and experiential learning.

Page 10: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Methods for Medical Students

• Projects to improve medical education • Case analysis (Headrick 1992)

• Chart audit and analysis (Henley 2002)

• Interprofessional student team projects in hospital, community or rural sites (Baker 1998, Headrick 2000, Blue 2001)

• Improvement projects as part of longitudinal clinical experiences (Weeks 2000, Gould 2002)

Page 11: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Methods for Residents• Morbidity and mortality conferences

(Sorokin 2002, Orlander 2002, Ziegelstein 2004)• Resident teams to improve the

residency (Ellrodt 1993)• Chart audits, peer & self (Paukert 2003,

Ziegelstein 2004)• Guideline design & implementation

(Frey et al 2003)• Improvement projects

– Hospitals (Weingart 1998, Ogrinc 2004)– Resident continuity practices

(Schillinger 2000, Coleman 2003, Mohr 2003)

Page 12: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Key Questions

• What should we teach?• How should we teach?• How will we measure

the results?– Learner assessment– Program evaluation

Page 13: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Learner Assessment

• Tests of knowledge• Self assessed

attitudes & skills• Problem solving• Performance-based

assessments

Page 14: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Program Evaluation

• Learner performance

• Learner satisfaction

• Faculty feedback• Costs• Clinical outcomes

Page 15: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Foundation Concepts,

Skills & Values

Limited Applications

Expanded Applications

DemonstratedBasic

Competency

BeginningMedical Student

AdvancedMedical Student

BeginningResident

AdvancedResident

Educating a Physician Able andExpecting to Improve Care

Page 16: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Example: Teaching Improvement to Medical Students

• Core Curriculum Year 1-2 at the University of Missouri-Columbia– Problem Based Learning – Introduction to Patient Care (IPC)– Ambulatory Care Experience

• Year 1 White Coat Ceremony– “The health of our patients is our first priority.

The highest quality health care is the environment for the highest quality education of future physicians.”

– “Committed to improving quality and safety”

Madigosky et al 2004

Page 17: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Year 2 IPC Modified Root Cause Analysis: Objectives

• Identify the gaps in quality within the cases

• Participate as a team member to identify strategies to close the gap

• Demonstrate an appreciation for an interprofessional approach

Madigosky et al 2004

Page 18: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Year 2 IPC Modified Root Cause Analysis: Methods

• Interdisciplinary teams– Year 2 medical students– Year 4 nursing students– Year 2 MHA graduate students– Pharmacy trainees

• Each team analyzed a patient case – What happened?– Why did it happen?– What would prevent it from happening

again? Madigosky et al 2004

Page 19: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Year 2 IPC Modified Root Cause Analysis: Student Feedback

Madigosky et al 2004

4.39

4.16

4.54

4.41

4.16

4.64

1 2 3 4 5

Recommend

Benefit

IP Useful

1=Strongly Disagree, 5=Strongly Agree

All Students Medical Students

Page 20: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Foundation Concepts,

Skills & Values

Limited Applications

Expanded Applications

DemonstratedBasic

Competency

BeginningMedical Student

AdvancedMedical Student

BeginningResident

AdvancedResident

Educating a Physician Able andExpecting to Improve Care

Page 21: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Example: Teaching Improvement to Residents

• MetroHealth-Dartmouth non-randomized, matched controlled trial

• Internal medicine residents (11 subjects, 22 controls)

Ogrinc et al 2004

Page 22: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

MetroHealth-Dartmouth Objectives

1. Describe the connection between professional knowledge and improvement knowledge

2. Develop and focus an aim for an improvement project

3. Understand a structured approach to improvement

4. Describe why and how various disciplines must work together to achieve improvement

Page 23: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

MetroHealth-Dartmouth Objectives, cont.

5. Demonstrate how data can be collected under time and resource limitations; appropriately display and analyze data

6. Use diagrams to understand the process under study

7. Identify areas to change within a process and recognize whether changes are successful

Ogrinc et al 2004

Page 24: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

MetroHealth-Dartmouth Methods

• Combination of didactic & experiential learning in a one-month elective

• Resident projects: Part of existing improvement initiatives or resident-generated

• Core faculty plus project sponsors

Ogrinc et al 2004

Page 25: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

MetroHealth-Dartmouth Measures

• Faculty evaluation of end-of-rotation resident presentation

• Quality Improvement Knowledge Application Tool (QIKAT), pre-post

• Knowledge and skills self-assessment, pre/post & 6-8 months later

• Resident satisfaction • Project sponsor feedback• Faculty & resident time logs Ogrinc et al 2004

Page 26: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Example Resident Projects

• Coordinating follow-up after admission for acute pain crisis in sickle cell disease

• Decreasing barriers to advance care planning in the outpatient setting

• Assessing osteoporosis knowledge and risk factors of patients in primary care

• Increasing the use of maximum sterile barrier precautions in the MICU

Ogrinc et al 2004

Page 27: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Difficulty/Variation in Getting Supplies

Nurse with Keys Resident Supply Room #1(Cordis, arterial line)

Locked Cabinet(triple lumens)

Unlocked Cabinet(gowns, sheets,

individual towels)

Supply Room #2(additional suture,

masks, caps)

Patient Room(patient, gauze,

Betadine, line caps,needle drivers,

saline, syringes)

Page 28: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

How the System Has Changed

Resident

Locked CabinetUnlocked Cabinet

Line Cart

Patient

Page 29: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

MetroHealth-Dartmouth Results

• Faculty rated project presentations highly

• QIKAT scores for participants improved; controls showed no change

• Participants’ ratings of 9/10 self-assessment items increased and remained elevated at 6 months

Ogrinc et al 2004

Page 30: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

ResultsQIKAT scores

7

8

9

10

11

12

13

Pretest Posttest

Aver

age

QIK

AT S

core Subjects

Controls

Page 31: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

MetroHealth-Dartmouth Study Results, cont.

• Participants rated experience highly re: achievement of learning objectives– “Like putting on a new pair of glasses”– “This training should be mandatory for all

residents”• Project sponsors appreciated resident

assistance with projects

Ogrinc et al 2004

Page 32: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Cost = Time

• Subjects averaged 119 hours (range 41-232) over the four weeks

• Faculty averaged 6 hours (range 3.3 - 8) over the four weeks

• Project sponsors averaged 1-2 hours/week

Ogrinc et al 2004

Page 33: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

Foundation Concepts,

Skills & Values

Limited Applications

Expanded Applications

DemonstratedBasic

Competency

BeginningMedical Student

AdvancedMedical Student

BeginningResident

AdvancedResident

Educating a Physician Able andExpecting to Improve Care

Page 34: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

What’s Next?

• IHI Medical School Collaborative– Aim: Create 10 exemplar schools in 3

years and 60 schools in 6 years • Accreditation Council for Graduate

Medical Education • Professional boards and societies• Quality Improvement in Medical

Education (QIMED) faculty development workshops

Page 35: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

References• American Academy of Pediatrics. Education in Quality Improvement for Pediatric Practice. http://www.eqipp.org.

Accessed March 24, 2004.• American Board of Internal Medicine. Recertification: Program for Continuous Professional Development Components.

http://www.abim.org/cpd/cpdhome/components.htm. Accessed March 24, 2004.• Accreditation Council for Graduate Medical Education. Outcome Project.

http://www.acgme.org/outcome/project/proHome.asp. • Accreditation Council for Graduate Medical Education Outcome Project. Toolbox of Assessment Methods, version 1.1.

September 2000. Available at http://www.acgme.org/outcome/.• Aron DC, Headrick LA. Educating Physicians Prepared to Improve Care and Safety is No Accident: It Requires a Systematic

Approach. Qual Safety Health Care 2002;11(2):168-173• Baker G, Gelmon S, Headrick L, Knapp M, Norman L, Quinn D, et al. Collaborating for Improvement in Health Professions

Education. Quality Management in Health Care 1998;6(2):1-11.• Batalden PB and Stoltz PA-C. A Framework for the Continual Improvement of Health Care: Building and Applying

Professional and Improvement Knowledge to Test Changes in Daily Work. Jt Comm Jl Qual Improv, 1993;19:424-452. • Batalden P, Berwick D, Bisognano M, Splaine M, Baker G, Headrick L. Knowledge Domains for Health Professional

Students Seeking Competency in the Continual Improvement and Innovation of Health Care. Boston, MA: Institute for Healthcare Improvement, 1998.

• Benneyan JC. Lloyd RC. Plsek PE. Statistical process control as a tool for research and healthcare improvement. Quality & Safety in Health Care. 2003;12(6):458-64.

• Berwick DM. A Primer on Leading the Improvement of Systems. British Medical Journal. 1996;312:619-622.• Blue AV, Kern DH, Chessman AW, Garr DR, Fowler SD, Lamar S, Kammermann SK, Baxley EG, Lahoz MR, White AW,

Bellack JP, West VT, Faulkner LR, McCurdy L. A Collaborative Clerkship with a Focus on Rural Community Health. Journal - South Carolina Medical Association. 2001;97:383-4, 387-9.

• Clinical Microsystems: Improving Health Care by Improving Microsystems. http://www.clinicalmicrosystem.org/. Accessed March 24, 2004.

• Coleman MT, Headrick LA, Langley AE, Thomas JX. Teaching medical faculty how to apply continuous quality improvement to medical education. Jt Comm J Qual Improv 1998;24:640-52.

• Coleman MT, Nasraty S, Ostapchuk M, Wheeler S, Looney S, Rhodes S. Introducing Practice-Based Learning and Improvement ACGME Core Competencies into a Family Medicine Residency Curriculum. Jt Comm J Quality Improv2003;29:238-47.

• Chisholm CD, Croskerry P. A case study in medical error: the use of the portfolio entry. Acad Emerg Med. 2004; 11(4); 388-92.

• Curley C, McEachern J, Speroff T. A firm trial of interdisciplinary rounds on the inpatient medical wards: an intervention designed using continuous quality improvement. Medical Care 1998;36(8 Suppl):AS4-12.

Page 36: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

References cont’d• Deyo RA. Schall M. Berwick DM. Nolan T. Carver P. Continuous quality improvement for patients with back pain. Journal of

General Internal Medicine. 2000;15(9):647-55.• Djuricich AM, Ciccarelli M, Swigonski NL. A continuous quality improvement curriculum for residents: Adressing this core

competency, improving systems. Acad Med. 2004; 79(10): S65-67.• Ellrodt A. Introduction of Total Quality Management (TQM) into an Internal Medicine Training Program . Acad Med

1993;68:817-23.• Frey K, Edwards F, Altman K, Spahr N, Gorman RS. The ‘Collaborative Care’ Curriculum: An Educational Model

Addressing Key ACGME Core Competencies in Primary Care Residency Training. Medical Education 2003; 37:786-89.• Frohna JG, Kalet A, Kachur E, Zabar S, Cox M, Halpern R, Hewson MG, Yedida MJ, Williams BC. Assessing residents’

competence in care management: Report of a consensus conference. Teaching and Learning in Medicine. 2004; 16(1):77-84.

• Giovino JM. Holding the Gains in Quality Improvement. Family Practice Management. 1999;6:29-34.• Gould B, Grey M, Huntington C, Gruman C, Rosen J, Storey E, et al. Improving Patient Care Outcomes by Teaching Quality

Improvement to Medical Students in Community-Based Practices. Acad Med 2002;77(10):1011-18.• Gould BE, O’Connell MT, Russell MT, Pipas CF, McCurdy FA. Teaching quality measurement and improvement, cost-

effectiveness, and patient satisfaction in undergraduate medical education: The UME-21 expereince. Family Medicine. 2004; 36Suppl:S57-62.

• Headrick LA, Neuhauser D, Melnikow J, Vanek E. Teaching Medical Students about Quality and Cost of Care at Case Western Reserve University. Acad Med 1992;67:157-159.

• Headrick LA. Learning to Improve Complex Systems of Care. In: Collaborative Education to Ensure Patient Safety.Washington, DC: HRSA/Bureau of Health Professions 2000;75-88.

• Henley E. A Quality Improvement Curriculum for Medical Students. Jt Comm Journal on Quality Improvement. 28(1):42-8, 2002 Jan.

• Institute for Healthcare Improvement. Quality Health Care.Org: Accelerating Improvement Worldwide. http://qualityhealthcare.org/qhc. Accessed March 24, 2004.

• Institute of Medicine. Health Professions Education: A Bridge to Quality. National Academies Press: Washington, D.C., 2003.

• Lynch DC, Swing SR, Horowitz SD, Holt K, Messer JV. Assessing practice-based learning and improvement. Teaching and Learning in Medicine. 2004; 16(1): 85-92.

• Madigosky W, Headrick LA, Nelson K, Anderson T, Cox K, Evans A. Using Modified Root Cause Analysis to Teach about Patient Safety. Unpublished report. University of Missouri Curators: Columbia, Missouri, 2004.

• Medical School Objectives Project. Report V. Contemporary Issues in Medicine: Quality of Care. Washington, D.C: Association of American Medical Colleges, 2001.

• Mohr JJ, Randolph GD, Laughon MM, Schaff E. Integrating Improvement Competencies into Residency Education: A Pilot Project from a Pediatric Continuity Clinic. Ambulatory Pediatrics 2003;3:131-6.

Page 37: Teaching Quality Improvement - IHI Home  · PDF fileTeaching Quality Improvement Linda A. Headrick, M.D., M.S. University of Missouri-Columbia headrickl@health.missouri.edu

References cont’d• Morrison LJ, Headrick LA, Ogrinc G, Foster T. The Quality Improvement Knowledge Application Tool: An Instrument to Assess

Knowledge Application in Practice-Based Learning and Improvement. (Abstract) JGIM 2003;18:250. • Nelson EC, Batalden PB, Ryer JC. Clinical Improvement Action Guide. Oakbrook Terrace, IL: Joint Commission on Accreditation of

Healthcare Organizations, 1998• Nelson EC et al. Building measurement and data collection into medical practice. Ann Int Med. 1998;128:460-66.• Neuhauser D and Diaz M. Daniel: Using the Bible to teach quality improvement methods. Qual and Safety in Health Care. 2004; 13(2):

153-3.• O’Connor GT, Plume SK, Olmstead EM, Morton JR et al. A Regional Intervention to Improve the Hospital Mortality Associated with

Coronary Artery Bypass Graft Surgery. JAMA 1996;275:841-846 • Ogrinc G, Headrick L, Mutha S, Coleman M, O'Donnell J, Miles P. A Framework for Teaching Medical Students and Residents about

Practice-Based Learning and Improvement, Synthesized from the Literature. Acad Med 2003;78:1-9.• Ogrinc G, Headrick LA, Morrison LJ, Foster T. Teaching and Assessing Resident Competence in Practice-based Learning and

Improvement. J Gen Internal Med 2004 (in press).• Orlander JD, Barber TW, Fincke BG. The Morbidity and Mortality Conference: The Delicate Nature of Learning from Error. Acad Med

2002;77:1001-06.• Paukert JL, Chumley-Jones HS, Littlefield JH. Do Peer Chart Audits Improve Residents’ Performance in Providing Preventive Care?

Acad Med 2003;78:S39-41.• Pierce-Bulger M,.Nighswander T. An approach to reducing infant mortality using quality improvement principles. Quality Management in

Health Care 2001;9:40-6.• Rivo ML, Keller DR, Teherani A, O’Connell MT, Weiss BA, Rubenstein SA. Practicing effectively in today’s health system: Teaching

systems-based care. Family Medicine. 2004; 36Suppl:S63-7.• Schillinger D, Wheeler M, Fernandez A. The Populations and Quality Improvement Seminar for Medical Residents. Acad Med

2000;75(5):562-3.• Sorokin R, Claves JL, Kane GC, Gottlieb JE. The Near Miss Resident Conference: Understanding the Barriers to Confronting Medical

Errors. Semin Med Pract 2002;5:12-19.• Swing SR. Assessing the ACGME General Competencies: General Considerations and Assessment Methods. Acad Emergency

Medicine 2002;9:1278-88.• Stevens DP. Finding Safety in Medical Education. Quality & Safety in Health Care. 2002;11:109-10.• Weeks W, Robinson J, Brooks W, PB B. Using Early Clinical Experiences to Integrate Quality-Improvement Learning into Medical

Education. Acad Med 2000;75(1):81-4.• Weingart S. A House Officer Sponsored Quality Improvement Initiative: Leadership Lessons and Liabilities. Jt Comm Journal on Quality

Improvement 1998;24:371-8• Wheeler DJ. Understanding Variation: The Key to Managing Chaos. 2nd edition. SPC Spress: Knoxville, TN, 2000.• Ziegelstein RC, Fiebach NH. “The Mirror” and “The Village”: A New Method for Teaching Practice-Based Learning and Improvement

and Systems-Based Practice. Acad Med 2004;79:83-88.


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