How big is doctors' prepaid income?
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D000367:Age Factors; D002204:Capitation Fee / Q000706:statistics & numerical data*; D003625:Data Collection; D004470:Economics, Medical; D006279:Health Maintenance Organizations / Q000191:economics*; D006801:Humans; D007182:Income / Q000706:statistics & numerical data*; D011243:Preferred Provider Organizations / Q000191:economics*; D011365:Professional Practice Location / Q000191:economics; D013038:Specialization; D014481:United States