title: Exception to the rule. Vanguard Health Systems to buy HMO; proves providers can run health plans.
authors.forename: B
authors.initials: B
authors.lastname: Kirchheimer
mesh_terms: D001130:Arizona; D006273:Health Facility Merger; D006279:Health Maintenance Organizations / Q000458:organization & administration*; D006777:Hospitals, Proprietary / Q000458:organization & administration*; D009096:Multi-Institutional Systems; D014481:United States