By the numbers. Physicians.
D002321:Career Choice; D004470:Economics, Medical; D005260:Female; D006123:Group Practice / Q000706:statistics & numerical data; D019538:Health Care Surveys; D006280:Health Workforce; D006801:Humans; D008297:Male; D008511:Medicine / Q000706:statistics & numerical data*; D010820:Physicians / Q000191:economics / Q000706:statistics & numerical data* / Q000600:supply & distribution; D013038:Specialization; D014481:United States