The state of PPOs: results from a national survey.
D054598:Blue Cross Blue Shield Insurance Plans / Q000639:trends; D003625:Data Collection; D006761:Hospitals; D006801:Humans; D007348:Insurance, Health / Q000639:trends*; D010820:Physicians; D011243:Preferred Provider Organizations / Q000706:statistics & numerical data / Q000639:trends*; D012051:Reimbursement Mechanisms; D014481:United States; D014600:Utilization Review