Retrospective StudiesCohort StudiesProspective StudiesObservationRisk FactorsFollow-Up StudiesTreatment OutcomeTime FactorsIntensive Care UnitsIncidenceMultivariate AnalysisSeverity of Illness IndexLongitudinal StudiesProportional Hazards ModelsCritical IllnessRisk AssessmentPredictive Value of TestsLogistic ModelsHIV InfectionsPrognosisAge FactorsComorbidityLength of StayAPACHEEpidemiologic MethodsBiological MarkersHospitalizationQuestionnairesPrevalenceAntiretroviral Therapy, Highly ActiveHospital MortalityKaplan-Meier EstimateCD4 Lymphocyte CountUnited StatesOutcome Assessment (Health Care)Infant, NewbornDisease ProgressionSurvival RateAnti-HIV AgentsOdds RatioDenmarkNetherlandsSurvival AnalysisIntensive CareKidney Failure, ChronicConfidence IntervalsRegistriesPatient AdmissionPregnancyRespiration, ArtificialMedication AdherencePatient DischargeEmergency Service, HospitalSouth AfricaROC CurveSex FactorsAcute Kidney InjuryRenal DialysisPostoperative ComplicationsViral LoadAcute DiseaseCause of DeathPain MeasurementDisability EvaluationQuality of LifeGreat Britain