Preoperative CarePostoperative ComplicationsTreatment OutcomePain, PostoperativePostoperative PeriodRetrospective StudiesFollow-Up StudiesProspective StudiesPreoperative PeriodHealth Services AccessibilityHealth ServicesHealth Services Needs and DemandMental Health ServicesFamily Planning ServicesHome Care ServicesPost and Core TechniqueHealth Services ResearchCommunity Health ServicesTime FactorsOperative TimeRural Health ServicesSurgical Procedures, OperativeHealth Services for the AgedChild Health ServicesReproductive Health ServicesPreventive Health ServicesLaparoscopyEmergency Medical ServicesMaternal Health ServicesUnited StatesCommunity Mental Health ServicesRectal NeoplasmsTomography, X-Ray ComputedPostoperative CareAdolescent Health ServicesRisk FactorsLibrary ServicesContract ServicesDiagnostic ServicesIntraoperative CareNursing ServicesIntraoperative ComplicationsReoperationSurgical Procedures, ElectiveDelivery of Health CareHealth Services AdministrationUrban Health ServicesBlood Loss, SurgicalPatient SatisfactionIntraoperative PeriodPredictive Value of TestsQuestionnairesState MedicineRisk AssessmentWomen's Health ServicesGreat BritainVascular Surgical ProceduresGenetic ServicesLength of StayUnited States Dept. of Health and Human ServicesEnglandReferral and ConsultationCardiac Surgical ProceduresPrognosisLogistic ModelsHealth Care SurveysDental Health ServicesCenters for Medicare and Medicaid Services (U.S.)Chi-Square DistributionPatient Acceptance of Health CareNeoadjuvant TherapyQuality of Health CareEmergency Service, HospitalDentistry, OperativeNeoplasm StagingSurvival RateCombined Modality TherapyHepatectomyCoronary Artery BypassHealth Services, IndigenousSocial WorkDigestive System Surgical ProceduresPatient SelectionMultivariate AnalysisOccupational Health ServicesSurgical Wound InfectionPrimary Health CareSurgical Procedures, Minimally InvasiveMarketing of Health ServicesAortic Aneurysm, AbdominalMagnetic Resonance ImagingOutcome Assessment (Health Care)Neurosurgical ProceduresProgram EvaluationPersonal Health ServicesPancreaticoduodenectomyFeasibility StudiesSeverity of Illness IndexCosts and Cost AnalysisCohort Studies