A comparative study of physicians from two decades.
D000328:Adult; D002321:Career Choice; D005260:Female; D006280:Health Workforce; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008511:Medicine / Q000639:trends; D008962:Models, Theoretical; D010820:Physicians / Q000600:supply & distribution; D012959:Socioeconomic Factors; D013038:Specialization; D014481:United States