2020
Cause‐specific mortality after diagnosis of cancer among HIV‐positive patients: A collaborative analysis of cohort studies
Trickey A, May MT, Gill MJ, Grabar S, Vehreschild J, Wit F, Bonnet F, Cavassini M, Abgrall S, Berenguer J, Wyen C, Reiss P, Grabmeier‐Pfistershammer K, Guest JL, Shepherd L, Teira R, Monforte A, del Amo J, Justice A, Costagliola D, Sterne J. Cause‐specific mortality after diagnosis of cancer among HIV‐positive patients: A collaborative analysis of cohort studies. International Journal Of Cancer 2020, 146: 3134-3146. PMID: 32003460, PMCID: PMC7187452, DOI: 10.1002/ijc.32895.Peer-Reviewed Original ResearchConceptsCause-specific mortalityCause of deathMortality rateGeneral populationLymphoma diagnosisCancer diagnosisHodgkin lymphoma diagnosisHIV-positive patientsCause-specific mortality ratesDiagnosis of cancerHIV cohortCohort studyCervical cancerSurvival outcomesLung cancerPLHIVSpecific cancersCancerCancer typesDiagnosisMortalityDeathSurvivalNADMAIDSFIB-4 stage of liver fibrosis is associated with incident heart failure with preserved, but not reduced, ejection fraction among people with and without HIV or hepatitis C
So-Armah KA, Lim JK, Re V, Tate JP, Chang CH, Butt AA, Gibert CL, Rimland D, Marconi VC, Goetz MB, Ramachandran V, Brittain E, Long M, Nguyen KL, Rodriguez-Barradas MC, Budoff MJ, Tindle HA, Samet JH, Justice AC, Freiberg MS, Team V. FIB-4 stage of liver fibrosis is associated with incident heart failure with preserved, but not reduced, ejection fraction among people with and without HIV or hepatitis C. Progress In Cardiovascular Diseases 2020, 63: 184-191. PMID: 32068085, PMCID: PMC7278895, DOI: 10.1016/j.pcad.2020.02.010.Peer-Reviewed Original ResearchMeSH KeywordsAdultAnti-HIV AgentsFemaleHealth StatusHeart FailureHepatitis CHIV InfectionsHIV Long-Term SurvivorsHumansIncidenceLiver CirrhosisMaleMiddle AgedPrognosisRisk AssessmentRisk FactorsSeverity of Illness IndexStroke VolumeTime FactorsUnited StatesVentricular Function, LeftVeterans HealthViral LoadConceptsType of HFIncident heart failureHeart failureHepatitis C statusAdvanced fibrosisLiver fibrosisEjection fractionHazard ratioC statusVeterans Aging Cohort StudyRisk of HFpEFLast clinic visitReduced ejection fractionAging Cohort StudyLiver fibrosis scoresPrevalent cardiovascular diseaseFirst HF eventProportional hazards modelIncident HFpEFHepatitis CClinic visitsCohort studyPrimary outcomeFibrosis scoreHF events
2018
Machine learning selected smoking-associated DNA methylation signatures that predict HIV prognosis and mortality
Zhang X, Hu Y, Aouizerat BE, Peng G, Marconi VC, Corley MJ, Hulgan T, Bryant KJ, Zhao H, Krystal JH, Justice AC, Xu K. Machine learning selected smoking-associated DNA methylation signatures that predict HIV prognosis and mortality. Clinical Epigenetics 2018, 10: 155. PMID: 30545403, PMCID: PMC6293604, DOI: 10.1186/s13148-018-0591-z.Peer-Reviewed Original ResearchConceptsWhite blood cellsSmoking-associated DNA methylationHIV prognosisInfection-related clinical outcomesBlood cellsSmoking-associated CpGsHIV-positive individualsImmune-related outcomesEpigenome-wide significant CpGsClinical outcomesTobacco smokingVeteran populationSurvival rateDNA methylation indexMortalityFrailtyHIVMethylation indexPrognosisMethylation signaturesDNA methylationOutcomesCell cycleCpGSignificant CpGsBilirubin Is Inversely Associated With Cardiovascular Disease Among HIV‐Positive and HIV‐Negative Individuals in VACS (Veterans Aging Cohort Study)
Marconi VC, Duncan MS, So‐Armah K, Re VL, Lim JK, Butt AA, Goetz MB, Rodriguez‐Barradas M, Alcorn CW, Lennox J, Beckman JA, Justice A, Freiberg M. Bilirubin Is Inversely Associated With Cardiovascular Disease Among HIV‐Positive and HIV‐Negative Individuals in VACS (Veterans Aging Cohort Study). Journal Of The American Heart Association 2018, 7: e007792. PMID: 29720501, PMCID: PMC6015337, DOI: 10.1161/jaha.117.007792.Peer-Reviewed Original ResearchConceptsAcute myocardial infarctionTotal cardiovascular diseaseIschemic stroke eventsCardiovascular diseaseCVD eventsHeart failureMyocardial infarctionTotal bilirubinElevated bilirubinStroke eventsRisk factorsIncident total CVDBaseline total bilirubinBaseline cardiovascular diseaseIncident CVD eventsHIV-negative individualsProspective cohort studyElevated bilirubin levelsMultiple risk factorsCohort studyCVD riskHazard ratioIschemic strokeHIV-positiveBilirubin levelsAssociation of Human Immunodeficiency Virus Infection and Risk of Peripheral Artery Disease
Beckman JA, Duncan MS, Alcorn CW, So-Armah K, Butt AA, Goetz M, Tindle HA, Sico J, Tracy RP, Justice AC, Freiberg MS. Association of Human Immunodeficiency Virus Infection and Risk of Peripheral Artery Disease. Circulation 2018, 138: 255-265. PMID: 29535090, PMCID: PMC6050082, DOI: 10.1161/circulationaha.117.032647.Peer-Reviewed Original ResearchConceptsRisk of PADIncident PAD eventsPeripheral artery diseaseHuman immunodeficiency virusCD4 cell countTraditional atherosclerotic risk factorsPAD risk factorsAtherosclerotic risk factorsPAD eventsRisk factorsCell countUninfected veteransCD4 cellsArtery diseaseHIV infectionHIV statusViral loadCells/Peripheral artery disease eventsPrior peripheral artery diseaseHuman immunodeficiency virus (HIV) infectionVeterans Aging Cohort StudyHIV-1 ribonucleic acidHIV infection statusHIV viral load
2017
Association of Cannabis, Stimulant, and Alcohol use with Mortality Prognosis Among HIV-Infected Men
Adams JW, Bryant KJ, Edelman J, Fiellin DA, Gaither JR, Gordon AJ, Gordon KS, Kraemer KL, Mimiaga MJ, Operario D, Tate JP, van den Berg JJ, Justice AC, Marshall BDL. Association of Cannabis, Stimulant, and Alcohol use with Mortality Prognosis Among HIV-Infected Men. AIDS And Behavior 2017, 22: 1341-1351. PMID: 28887669, PMCID: PMC5881942, DOI: 10.1007/s10461-017-1905-4.Peer-Reviewed Original ResearchConceptsVeterans Aging Cohort StudyLow-risk alcohol useRisk alcohol useMortality riskAlcohol useStimulant useAdjusted longitudinal analysesAging Cohort StudyUnhealthy alcohol useAssociation of cannabisVACS IndexCause mortalityCohort studyPatient populationPrognostic indicatorMortality prognosisHIVStudy periodSubstance useCannabisRiskLongitudinal analysisMenMortalityStimulantsCD4:CD8 Ratio and CD8 Count as Prognostic Markers for Mortality in Human Immunodeficiency Virus–Infected Patients on Antiretroviral Therapy: The Antiretroviral Therapy Cohort Collaboration (ART-CC)
Trickey A, May MT, Schommers P, Tate J, Ingle SM, Guest JL, Gill MJ, Zangerle R, Saag M, Reiss P, Monforte A, Johnson M, Lima VD, Sterling TR, Cavassini M, Wittkop L, Costagliola D, Sterne JAC, Boulle A, Stephan C, Miro J, Cavassini M, Chêne G, Costagliola D, Dabis F, Monforte A, del Amo J, Van Sighem A, Vehreschild J, Gill J, Guest J, Haerry D, Hogg R, Justice A, Shepherd L, Obel N, Crane H, Smith C, Reiss P, Saag M, Sterling T, Teira R, Williams M, Zangerle R, Sterne J, May M, Ingle S, Trickey A. CD4:CD8 Ratio and CD8 Count as Prognostic Markers for Mortality in Human Immunodeficiency Virus–Infected Patients on Antiretroviral Therapy: The Antiretroviral Therapy Cohort Collaboration (ART-CC). Clinical Infectious Diseases 2017, 65: 959-966. PMID: 28903507, PMCID: PMC5850630, DOI: 10.1093/cid/cix466.Peer-Reviewed Original ResearchConceptsAdjusted hazard ratioCD8 countsCD8 ratioCohort CollaborationAntiretroviral therapyCause mortalityCD4 countHazard ratioMiddle tertilePrognostic markerAIDS mortalityCause-specific mortality hazard ratiosAntiretroviral Therapy Cohort CollaborationHigher CD4 countsMortality hazard ratioCells/μLHuman immunodeficiency virusIndependent prognostic markerNorth American cohortAssociation of CD8Shape of associationsAssociation of CD4Immunodeficiency virusHuman immunodeficiencyCD4Risk of End‐Stage Renal Disease in HIV‐Positive Potential Live Kidney Donors
Muzaale AD, Althoff KN, Sperati CJ, Abraham AG, Kucirka LM, Massie AB, Kitahata MM, Horberg MA, Justice AC, Fischer MJ, Silverberg MJ, Butt AA, Boswell SL, Rachlis AR, Mayor AM, Gill MJ, Eron JJ, Napravnik S, Drozd DR, Martin JN, Bosch RJ, Durand CM, Locke JE, Moore RD, Lucas GM, Segev DL. Risk of End‐Stage Renal Disease in HIV‐Positive Potential Live Kidney Donors. American Journal Of Transplantation 2017, 17: 1823-1832. PMID: 28497525, PMCID: PMC5489376, DOI: 10.1111/ajt.14235.Peer-Reviewed Original ResearchMeSH KeywordsAdultCase-Control StudiesFemaleFollow-Up StudiesGlomerular Filtration RateGraft RejectionGraft SurvivalHIV InfectionsHIV SeropositivityHIV-1HumansIncidenceKidney Failure, ChronicKidney Function TestsKidney TransplantationLiving DonorsMaleMiddle AgedNephrectomyNorth AmericaPrognosisRisk FactorsViral LoadConceptsEnd-stage renal diseaseIncidence of ESRDHIV-positive individualsLive kidney donorsKidney donorsRenal diseaseMultivariable Cox proportional hazards regressionCox proportional hazards regressionPotential live kidney donorsHIV-negative peersHIV-negative participantsHIV-positive participantsProportional hazards regressionCopies/mLKidney donor candidatesCumulative incidence estimatesCohort CollaborationCumulative incidenceHIV infectionViral loadHazards regressionNational HealthPositive individualsIncidence estimatesHealth characteristics
2014
Increased Risk of Radiographic Emphysema in HIV Is Associated With Elevated Soluble CD14 and Nadir CD4
Attia EF, Akgün KM, Wongtrakool C, Goetz MB, Rodriguez-Barradas MC, Rimland D, Brown ST, Hoo G, Kim J, Lee PJ, Schnapp LM, Sharafkhaneh A, Justice AC, Crothers K. Increased Risk of Radiographic Emphysema in HIV Is Associated With Elevated Soluble CD14 and Nadir CD4. CHEST Journal 2014, 146: 1543-1553. PMID: 25080158, PMCID: PMC4251616, DOI: 10.1378/chest.14-0543.Peer-Reviewed Original ResearchMeSH KeywordsAdultAge FactorsBiomarkersCD4 AntigensComorbidityConfidence IntervalsCross-Sectional StudiesFemaleHIV InfectionsHumansLipopolysaccharide ReceptorsLogistic ModelsMaleMiddle AgedMultivariate AnalysisOdds RatioPrognosisPulmonary EmphysemaRadiographyReference ValuesRisk AssessmentSensitivity and SpecificitySeverity of Illness IndexSex FactorsStatistics, NonparametricConceptsIndependent risk factorSoluble CD14 levelsHIV infectionRadiographic emphysemaEmphysema severityCD14 levelsRisk factorsHIV-Associated Lung Emphysema (EXHALE) studyHigher soluble CD14 levelsNadir CD4 cell countMultivariable logistic regression modelElevated soluble CD14CD4 cell countCells/μLLower lung zonesRisk of HIVCross-sectional analysisLogistic regression modelsNadir CD4HIV RNALung involvementHIV severityD-dimerDiffuse involvementMultivariable analysisContinuity in a VA Patient-Centered Medical Home Reduces Emergency Department Visits
Chaiyachati KH, Gordon K, Long T, Levin W, Khan A, Meyer E, Justice A, Brienza R. Continuity in a VA Patient-Centered Medical Home Reduces Emergency Department Visits. PLOS ONE 2014, 9: e96356. PMID: 24867300, PMCID: PMC4035271, DOI: 10.1371/journal.pone.0096356.Peer-Reviewed Original ResearchConceptsPrimary care providersPrimary care clinicsContinuity of carePatient Aligned Care TeamsED visitsEmergency departmentPCMH modelClinic visitsED utilizationCare clinicsCare servicesVeterans Affairs primary care clinicsMultivariable logistic regression analysisVA primary care clinicsTotal clinic visitsObservational cohort studyPrimary care visitsLogistic regression analysisLower ED utilizationOutcomes of interestCare visitsCohort studyVA patientsCare teamMedical home
2013
Cohort Profile: Antiretroviral Therapy Cohort Collaboration (ART-CC)
May MT, Ingle SM, Costagliola D, Justice AC, de Wolf F, Cavassini M, Monforte A, Casabona J, Hogg RS, Mocroft A, Lampe FC, Dabis F, Fätkenheuer G, Sterling TR, del Amo J, Gill MJ, Crane HM, Saag MS, Guest J, Brodt HR, Sterne J, Collaboration T. Cohort Profile: Antiretroviral Therapy Cohort Collaboration (ART-CC). International Journal Of Epidemiology 2013, 43: 691-702. PMID: 23599235, PMCID: PMC4052127, DOI: 10.1093/ije/dyt010.Peer-Reviewed Original ResearchMeSH KeywordsAcquired Immunodeficiency SyndromeAge FactorsAnti-HIV AgentsAntiretroviral Therapy, Highly ActiveBiomarkersCD4 Lymphocyte CountCohort StudiesCoinfectionEuropeFemaleHIV InfectionsHumansLife ExpectancyNorth AmericaPregnancyPrognosisResidence CharacteristicsRisk FactorsSex FactorsSocioeconomic FactorsTime FactorsViral LoadConceptsAntiretroviral Therapy Cohort CollaborationCombination antiretroviral therapyAntiretroviral therapyCohort CollaborationHIV biomarkersCohort studyClinical eventsHuman immunodeficiency virus-infected individualsEffective combination antiretroviral therapyIndividual cohort studiesVirus-infected individualsHIV Cohort StudyHIV-1 infectionImmune deficiency syndromeCause of deathART regimenHepatitis CAdult patientsAIDS eventsPatient demographicsRisk factorsDeficiency syndromeLiver enzymesPrognostic analysisDrug useHazardous drinking and its association with homelessness among veterans in care
Ghose T, Fiellin DA, Gordon AJ, Metraux S, Goetz MB, Blackstock O, McInnes K, Rodriguez-Barradas MC, Justice AC. Hazardous drinking and its association with homelessness among veterans in care. Drug And Alcohol Dependence 2013, 132: 202-206. PMID: 23474200, PMCID: PMC8101641, DOI: 10.1016/j.drugalcdep.2013.02.004.Peer-Reviewed Original ResearchConceptsVeterans Affairs Health Care SystemHazardous drinkingVeterans Aging Cohort StudyAlcohol useAging Cohort StudyLogistic regression modelsHealth care systemCohort studyVA careOlder veteransAlcohol abuseAlcohol misuseEarly interventionBrief interventionAlcohol dependenceHazardous useLow levelsBaselineCare systemRisk of homelessnessCareVeteransDrinkingRiskHousing stability
2012
Heterogeneity in outcomes of treated HIV-positive patients in Europe and North America: relation with patient and cohort characteristics
May MT, Hogg RS, Justice AC, Shepherd BE, Costagliola D, Ledergerber B, Thiébaut R, Gill MJ, Kirk O, van Sighem A, Saag MS, Navarro G, Sobrino-Vegas P, Lampe F, Ingle S, Guest JL, Crane HM, Monforte A, Vehreschild JJ, Sterne J, Collaboration T. Heterogeneity in outcomes of treated HIV-positive patients in Europe and North America: relation with patient and cohort characteristics. International Journal Of Epidemiology 2012, 41: 1807-1820. PMID: 23148105, PMCID: PMC3535877, DOI: 10.1093/ije/dys164.Peer-Reviewed Original ResearchConceptsCompleteness of ascertainmentHIV-positive patientsAntiretroviral therapyMortality rateAdult HIV-positive patientsPrevious AIDS diagnosisRates of AIDSAdjusted mortality rateMortality rate ratiosHigher mortality riskHigh mortality rateDiverse patient cohortCohort heterogeneityCohort CollaborationPatient characteristicsHIV treatmentAIDS diagnosisPatient cohortAdjusted ratesClinical careMortality riskCohort characteristicsPatientsDeath ascertainmentCohortDoes an Index Composed of Clinical Data Reflect Effects of Inflammation, Coagulation, and Monocyte Activation on Mortality Among Those Aging With HIV?
Justice AC, Freiberg MS, Tracy R, Kuller L, Tate JP, Goetz MB, Fiellin DA, Vanasse GJ, Butt AA, Rodriguez-Barradas MC, Gibert C, Oursler KA, Deeks SG, Bryant K, Team T. Does an Index Composed of Clinical Data Reflect Effects of Inflammation, Coagulation, and Monocyte Activation on Mortality Among Those Aging With HIV? Clinical Infectious Diseases 2012, 54: 984-994. PMID: 22337823, PMCID: PMC3297653, DOI: 10.1093/cid/cir989.Peer-Reviewed Original ResearchConceptsHIV-1 RNANet reclassification improvementHepatitis C virusD-dimerIL-6VACS IndexMonocyte activationVeterans Aging Cohort Study (VACS) IndexHuman immunodeficiency virus type 1 (HIV-1) RNAFIB-4 indexGlomerular filtration rateMarkers of liverRoutine clinical variablesCopies/mLPrediction of mortalityEffects of inflammationHCV statusAntiretroviral therapyCD4 countRenal injuryReclassification improvementClinical variablesC-statisticC virusFiltration rate
2009
Prognosis of patients treated with cART from 36 months after initiation, according to current and previous CD4 cell count and plasma HIV-1 RNA measurements
Lanoy E, May M, Mocroft A, Phillip A, Justice A, Chêne G, Furrer H, Sterling T, Monforte A, Force L, Gill J, Harris R, Hogg R, Rockstroh J, Saag M, Khaykin P, de Wolf F, Sterne J, Costagliola D. Prognosis of patients treated with cART from 36 months after initiation, according to current and previous CD4 cell count and plasma HIV-1 RNA measurements. AIDS 2009, 23: 2199-2208. PMID: 19779320, PMCID: PMC3122149, DOI: 10.1097/qad.0b013e3283305a00.Peer-Reviewed Original ResearchConceptsCombination antiretroviral therapyCD4 cell countHIV-1-infected patientsHIV-1 RNAViral loadCART initiationCell countStart of cARTHIV-1 RNA measurementsART Cohort CollaborationMedian CD4 cellPredictors of AIDSRates of AIDSImportant prognostic factorPrognosis of patientsCohort CollaborationSubsequent AIDSAntiretroviral therapyHIV cohortCD4 cellsPrognostic factorsPrognostic importanceCopies/PatientsAIDSVariable Impact on Mortality of AIDS-Defining Events Diagnosed during Combination Antiretroviral Therapy: Not All AIDS-Defining Conditions Are Created Equal
Mocroft A, Sterne J, Egger M, May M, Grabar S, Furrer H, Sabin C, Fatkenheuer G, Justice A, Reiss P, d'Arminio Monforte A, Gill J, Hogg R, Bonnet F, Kitahata M, Staszewski S, Casabona J, Harris R, Saag M. Variable Impact on Mortality of AIDS-Defining Events Diagnosed during Combination Antiretroviral Therapy: Not All AIDS-Defining Conditions Are Created Equal. Clinical Infectious Diseases 2009, 48: 1138-1151. PMID: 19275498, PMCID: PMC3032444, DOI: 10.1086/597468.Peer-Reviewed Original ResearchConceptsCombination antiretroviral therapyMortality hazard ratioAntiretroviral therapyHazard ratioCombination antiretroviral therapy eraClinical end point trialsAntiretroviral therapy eraHIV transmission groupEnd point trialHIV RNA loadPneumocystis jiroveci pneumoniaProgressive multifocal leukoencephalopathyMortality of AIDSProportional hazards modelCommon ADEsMedian followTherapy eraJiroveci pneumoniaMultifocal leukoencephalopathyEsophageal candidiasisImmunodeficiency syndromeHodgkin's lymphomaRNA loadAntiretroviral drugsKaposi's sarcoma
2008
Prognostic Importance of Anaemia in HIV Type-1-Infected Patients Starting Antiretroviral Therapy: Collaborative Analysis of Prospective Cohort Studies
Harris RJ, Sterne J, Abgrall S, Dabis F, Reiss P, Saag M, Phillips AN, Chêne G, Gill JM, Justice AC, Rockstroh J, Sabin CA, Mocroft A, Bucher HC, Hogg RS, Monforte AD, May M, Egger M. Prognostic Importance of Anaemia in HIV Type-1-Infected Patients Starting Antiretroviral Therapy: Collaborative Analysis of Prospective Cohort Studies. Antiviral Therapy 2008, 13: 959-967. PMID: 19195321, PMCID: PMC4507810, DOI: 10.1177/135965350801300802.Peer-Reviewed Original ResearchConceptsHIV type-1-infected patientsMild anemiaAntiretroviral therapyHemoglobin levelsAdjusted hazard ratioMonths of HAARTStart of HAARTActive antiretroviral therapyT-cell countsPrevalence of anemiaProspective cohort studyLong-term prognosisBaseline anemiaAIDS eventsHazard ratioCohort studyPrognostic importancePrognostic valueProspective studyUntreated individualsPatientsAnemiaHigh mortalityHAARTNormal hemoglobin
2007
Prognosis of HIV-1-infected patients up to 5 years after initiation of HAART: collaborative analysis of prospective studies
May M, Sterne JA, Sabin C, Costagliola D, Justice AC, Thiébaut R, Gill J, Phillips A, Reiss P, Hogg R, Ledergerber B, D'Arminio Monforte A, Schmeisser N, Staszewski S, Egger M. Prognosis of HIV-1-infected patients up to 5 years after initiation of HAART: collaborative analysis of prospective studies. AIDS 2007, 21: 1185-1197. PMID: 17502729, PMCID: PMC3460385, DOI: 10.1097/qad.0b013e328133f285.Peer-Reviewed Original ResearchConceptsStart of HAARTCD4 cell countCell countHIV-1 RNA levelsHIV-1-infected patientsInitiation of HAARTTreatment-naive patientsDiagnosis of AIDSInjection drug useVirological responseHIV careNew AIDSCumulative incidenceParametric survival modelsClinical stageProspective studyRisk calculatorHAARTProgression rateTreatment changesPatientsDrug usePrognostic modelAIDSCells/
2006
HIV treatment response and prognosis in Europe and North America in the first decade of highly active antiretroviral therapy: a collaborative analysis
May MT, Sterne JA, Costagliola D, Sabin CA, Phillips AN, Justice AC, Dabis F, Gill J, Lundgren J, Hogg RS, de Wolf F, Fätkenheuer G, Staszewski S, d'Arminio Monforte A, Egger M. HIV treatment response and prognosis in Europe and North America in the first decade of highly active antiretroviral therapy: a collaborative analysis. The Lancet 2006, 368: 451-458. PMID: 16890831, DOI: 10.1016/s0140-6736(06)69152-6.Peer-Reviewed Original ResearchConceptsActive antiretroviral therapyCD4 cell countAntiretroviral therapyHazard ratioTreatment responseTreatment-naive HIV-1-infected adultsCell countHIV-1-infected adultsMedian CD4 cell countHIV-1 RNA copiesCharacteristics of patientsHIV-1 RNAShort-term prognosisHIV treatment responseProportion of womenPrimary endpointVirological responseCohort studyHIV infectionCox regressionHAARTPatientsRNA copiesCorresponding figurePrognosis
2004
Development and validation of a prognostic model for survival time data: application to prognosis of HIV positive patients treated with antiretroviral therapy
May M, Royston P, Egger M, Justice AC, Sterne J, Collaboration F. Development and validation of a prognostic model for survival time data: application to prognosis of HIV positive patients treated with antiretroviral therapy. Statistics In Medicine 2004, 23: 2375-2398. PMID: 15273954, DOI: 10.1002/sim.1825.Peer-Reviewed Original Research