Investor-owned hospitals study PPO concept; leaders of industry adopt "wait-and-see" policy.
D003695:Delivery of Health Care / Q000639:trends*; D006264:Health Benefit Plans, Employee / Q000639:trends*; D006761:Hospitals / Q000639:trends*; D006777:Hospitals, Proprietary / Q000639:trends*; D007348:Insurance, Health / Q000639:trends*; D014481:United States