title: Defining gatekeepers for Medicare managed care.
authors.forename: S E
authors.initials: SE
authors.lastname: Krentz
mesh_terms: D017598:Efficiency, Organizational; D017048:Health Care Costs; D008329:Managed Care Programs; D006278:Medicare / Q000191:economics / Q000458:organization & administration*; D010821:Physicians, Family / Q000145:classification*; D014481:United States; D000078329:Workforce