Is managed care working? Part 1 of 2.
D014487:Centers for Medicare and Medicaid Services, U.S.; D003363:Cost Control / Q000639:trends; D017049:Employer Health Costs / Q000639:trends*; D006279:Health Maintenance Organizations / Q000191:economics*; D006801:Humans; D011243:Preferred Provider Organizations / Q000191:economics*; D014481:United States