Formal hospital/HMO contracts increase: survey.
D003284:Contract Services / Q000458:organization & administration; D003625:Data Collection; D005376:Financial Management / Q000639:trends*; D005377:Financial Management, Hospital / Q000639:trends*; D006279:Health Maintenance Organizations / Q000458:organization & administration*; D009935:Organizational Affiliation / Q000639:trends; D013223:Statistics as Topic; D014481:United States