title: Hospitals cite co-op rules, not sale, in MedEcon defection.
mesh_terms: D003132:Commerce / Q000639:trends; D003284:Contract Services / Q000639:trends; D017754:Group Purchasing / Q000458:organization & administration* / Q000592:standards; D006801:Humans; D007373:Interinstitutional Relations; D009657:North Carolina; D010067:Ownership; D011682:Purchasing, Hospital / Q000639:trends*; D013781:Texas