Practice of obstetrics and gynecology in the United States.
D000488:Allied Health Personnel; D005260:Female; D006123:Group Practice; D006176:Gynecology; D006801:Humans; D008511:Medicine; D009774:Obstetrics; D011247:Pregnancy; D011331:Private Practice; D013038:Specialization; D014481:United States; D014505:Urban Population