Variation in medical practice. A review of the literature.
D003625:Data Collection; D006761:Hospitals / Q000706:statistics & numerical data*; D006801:Humans; D010818:Practice Patterns, Physicians' / Q000639:trends*; D013223:Statistics as Topic; D013514:Surgical Procedures, Operative / Q000706:statistics & numerical data*; D014481:United States