The practice of medicine: past, present, and future.
D002568:Certification; D003153:Community Health Services; D003479:Curriculum; D003695:Delivery of Health Care; D004501:Education, Medical; D004503:Education, Medical, Graduate; D049673:History, 20th Century; D010823:Physician Assistants; D012041:Regional Medical Programs; D013222:State Medicine; D014481:United States