title: Doctors who perform operations. A study on in-hospital surgery in four diverse geographic areas (second of two parts).
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D002568:Certification; D013502:General Surgery / Q000706:statistics & numerical data*; D049690:History, Ancient; D006801:Humans; D008511:Medicine; D008875:Middle Aged; D010821:Physicians, Family / Q000600:supply & distribution; D011364:Professional Practice; D013038:Specialization; D013514:Surgical Procedures, Operative; D014481:United States