Variation among physicians in use of laboratory tests: relation to quality of care.
D000787:Angina Pectoris / Q000175:diagnosis; D019411:Clinical Laboratory Techniques; D003325:Coronary Care Units; D003365:Costs and Cost Analysis; D004219:District of Columbia; D005260:Female; D006784:Hospitals, Teaching; D006801:Humans; D007388:Internal Medicine; D007396:Internship and Residency; D008297:Male; D008485:Medical Audit; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis; D010146:Pain; D010820:Physicians