Retrospective StudiesTime FactorsFollow-Up StudiesRisk FactorsTreatment OutcomeProspective StudiesInfant, NewbornAge FactorsLongitudinal StudiesPrevalenceAge DistributionCohort StudiesUnited StatesSeasonsSex FactorsPostoperative ComplicationsSex DistributionEnglandHospitalizationPrognosisRegistriesLogistic ModelsSurvival RateAnti-Bacterial AgentsHistory, 20th CenturyRecurrenceQuestionnairesPregnancyCross-Sectional StudiesRisk AssessmentGreat BritainLength of StaySeverity of Illness IndexHospitals, UniversityPopulation SurveillanceFranceJapanGreeceMedical AuditWounds and InjuriesMinnesotaCause of DeathBacteremiaIndiaNorthern IrelandReoperationPredictive Value of TestsTomography, X-Ray ComputedIsraelWisconsinCanadaSurvival AnalysisMultivariate AnalysisSensitivity and SpecificityChi-Square DistributionCross InfectionAcute DiseaseSwedenSpainHospitals, TeachingHospitals, GeneralSocioeconomic FactorsPhylogenyDisease ProgressionRegression AnalysisForecastingComorbidityScotlandMicrobial Sensitivity TestsMolecular EpidemiologyChronic DiseaseMass ScreeningMortalityDatabases, FactualItalyOdds RatioAustraliaHospital MortalityReferral and ConsultationSmokingGeographyUrban PopulationCaliforniaNeoplasmsCase-Control StudiesHealth SurveysEmergency Service, HospitalWalesDenmarkDisease OutbreaksOntarioRiskNigeriaOccupational DiseasesTimeReproducibility of ResultsData CollectionHospitalsWounds, NonpenetratingVascular Surgical Procedures