Ambulatory Surgical ProceduresAmbulatory CareLength of StayInpatientsTreatment OutcomeHospitals, PsychiatricHospitalizationUtilization ReviewPatient AdmissionPatient DischargeRetrospective StudiesHealth Care CostsUnited StatesProspective StudiesTime FactorsOutpatient Clinics, HospitalCost-Benefit AnalysisEnglandHospital CostsRehabilitation CentersPsychiatric Department, HospitalAmbulatory Care FacilitiesFollow-Up StudiesPostoperative ComplicationsSurgical Procedures, OperativeRisk FactorsHospitals, TeachingHospitals