Nursing PPOs for corporate clients.
D003284:Contract Services; D005376:Financial Management; D006279:Health Maintenance Organizations; D006801:Humans; D007348:Insurance, Health / Q000191:economics*; D009739:Nursing Services / Q000191:economics*; D009785:Occupational Health Nursing; D011243:Preferred Provider Organizations / Q000191:economics*; D014481:United States