Hospital DepartmentsMassachusettsHospitals, GeneralBostonCaregiversRetrospective StudiesHospitalsFranceTreatment OutcomeQuestionnairesHospitals, DistrictEmergency Service, HospitalHospitals, TeachingHospitals, UniversityPsychiatric Department, HospitalHospitals, SpecialHospital CostsEnglandUnited StatesNursing Staff, HospitalHospitals, UrbanLength of StayHospitalizationProspective StudiesPatient AdmissionMedical AuditHospital Bed Capacity