Hospital-Physician RelationsPhysiciansPhysicians, FamilyPhysicians, Primary CarePhysician's Practice PatternsPhysician's RoleHospitals, TeachingHospitals, UniversityHospitals, GeneralPhysicians, WomenHospital CostsAttitude of Health PersonnelNursing Staff, HospitalHospitals, UrbanUnited StatesPhysician AssistantsPhysician-Patient RelationsEconomics, HospitalHospitals, PediatricHospitals, SpecialMedicineHospital Bed CapacitySpecializationEmergency Service, HospitalQuestionnairesHospitals, DistrictPhysicians' OfficesPhysician Impairment