1999k-660 administration care congresses corporatization deliveryofhealthcare economicaspects economics ethics financialmanagement groupmedicalpractice grouppractice healthfacilities healthmaintenanceorganizations hospital hospital-physicianjointventures hospitaladministration hospitals interprofessionalrelations jurisprudence lawandlegislation medical medicaleconomics medicallawsandlegislation medicalstaff organization practicemanagement professionalcorporations professionalpractice proprietary sociologicalaspects states trends unitedstates w87r662c1999 w92c669c1998 wx157n532 wx157n5321983 wx160c8221985 wx27aa1f61986 wx27aa1l695m1992