title: The union experience with health maintenance organizations and preferred provider organizations.
authors.forename: H C
authors.initials: HC
authors.lastname: Sigelbaum
mesh_terms: D006279:Health Maintenance Organizations / Q000191:economics*; D007348:Insurance, Health / Q000191:economics*; D007750:Labor Unions; D011243:Preferred Provider Organizations / Q000191:economics*; D014481:United States