Hospital-Physician Joint VenturesHospitalistsPhysiciansMedical Staff, HospitalPsychoneuroimmunologyHospital Bed Capacity, 300 to 499Capital FinancingAir PollutantsRespiratory Tract DiseasesInvestmentsAir PollutionWorkplaceJointsEnvironmental MonitoringGermanyQuestionnairesEnvironmental ExposureEquipment and SuppliesAcute DiseaseHealth StatusFees and ChargesMedicare Part BOwnershipPhysician's Practice Patterns