Kaplan-Meier EstimateRetrospective StudiesProportional Hazards ModelsPrognosisTreatment OutcomeSurvival RateFollow-Up StudiesTime FactorsRadiation Leukemia VirusDisease-Free SurvivalSurvival AnalysisAcetic AnhydridesCohort StudiesRisk FactorsRhodobacter sphaeroidesNeoplasm StagingHerpesvirus 1, SuidProspective StudiesMolecular Sequence Data