A report on the first periodic survey of physicians.
D000328:Adult; D000368:Aged; D000574:American Medical Association; D005194:Family Practice; D006801:Humans; D008511:Medicine; D008875:Middle Aged; D010820:Physicians; D013038:Specialization; D013223:Statistics as Topic; D011795:Surveys and Questionnaires; D014481:United States; D014507:Urbanization