Hospital DepartmentsMassachusettsHospitals, GeneralBostonCaregiversRetrospective StudiesHospitalsFranceTreatment OutcomeQuestionnairesPower (Psychology)Emergency Service, HospitalHospitals, TeachingHospitals, UniversityPsychiatric Department, HospitalHospitals, SpecialHospital CostsEnglandNursing Staff, HospitalProspective StudiesHospitals, UrbanHospitalizationLength of StayUnited StatesPatient AdmissionMedical AuditHospital Bed Capacity