title: The "value added" of not-for-profit health plans.
authors.affiliation: Group Health Cooperative of Puget Sound, Seattle, WA 98121, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: Nudelman
authors.forename: L M
authors.initials: LM
authors.lastname: Andrews
mesh_terms: D003695:Delivery of Health Care / Q000191:economics; D006279:Health Maintenance Organizations / Q000191:economics; D007348:Insurance, Health / Q000191:economics*; D011314:Preventive Health Services; D014481:United States