title: Merged provider groups take on Kaiser.
authors.forename: H
authors.initials: H
authors.lastname: Larkin
mesh_terms: D003695:Delivery of Health Care / Q000639:trends*; D004465:Economic Competition; D006273:Health Facility Merger; D008329:Managed Care Programs / Q000639:trends*; D015205:Northwestern United States; D009922:Oregon