Retrospective StudiesTreatment OutcomeResearch DesignTime FactorsFollow-Up StudiesRisk FactorsCohort StudiesDrug DesignInfant, NewbornPrognosisIncidencePregnancyUnited StatesPostoperative ComplicationsAge FactorsProspective StudiesSurvival RateEquipment DesignRisk AssessmentPrevalenceCross-Sectional StudiesMultivariate AnalysisLength of StayLogistic ModelsSensitivity and SpecificitySurvival AnalysisReproducibility of ResultsSeverity of Illness IndexPredictive Value of TestsOutcome Assessment (Health Care)Case-Control StudiesChi-Square DistributionRecurrenceTomography, X-Ray ComputedQuestionnairesNeoplasm StagingHealth Services ResearchHospitalization