How do managed care ties affect a doctor's decision to advertise?
D000329:Advertising / Q000191:economics / Q000706:statistics & numerical data*; D003365:Costs and Cost Analysis / Q000706:statistics & numerical data; D003625:Data Collection; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data; D010820:Physicians / Q000191:economics / Q000706:statistics & numerical data*; D011243:Preferred Provider Organizations / Q000706:statistics & numerical data; D014481:United States