HIV SeropositivityHIV SeroprevalenceHIV InfectionsLymphomaSubstance Abuse, IntravenousSexual BehaviorRisk FactorsLymphoma, B-CellLymphoma, Non-HodgkinDisease ProgressionSeroepidemiologic StudiesLymphoma, T-CellLymphoma, Large B-Cell, DiffuseLymphoma, FollicularBurkitt LymphomaCell DeathLymphoma, B-Cell, Marginal ZoneCause of DeathLymphoma, Mantle-CellLymphoma, T-Cell, CutaneousLymphoma, AIDS-RelatedLymphoma, T-Cell, PeripheralLymphoma, Large-Cell, AnaplasticAntibodies, ViralImmunoglobulin GAntibodies, BacterialChlamydophila pneumoniaeHodgkin DiseaseEnzyme-Linked Immunosorbent AssayChlamydophila InfectionsDeathSerologic TestsHIV SeronegativityPrevalenceHelicobacter pyloriHelicobacter InfectionsLymphoma, Large-Cell, ImmunoblasticTime FactorsTreatment OutcomePrognosisRetrospective StudiesAcquired Immunodeficiency SyndromeFollow-Up StudiesCell Line, TumorVincristineCohort StudiesProspective StudiesCase-Control StudiesImmunohistochemistryHIV-1ToxocariasisAge FactorsAntibodies, Monoclonal, Murine-DerivedCytomegalovirus InfectionsAntibodies, ProtozoanPrednisoneApoptosisCross-Sectional StudiesSurvival AnalysisAntineoplastic Combined Chemotherapy ProtocolsHepatitis CPolymerase Chain ReactionIncidenceToxoplasmosisCell CycleAntigens, CD20DoxorubicinGene Expression Regulation, NeoplasticSurvival RateCyclophosphamideTranslocation, GeneticHerpesvirus 2, HumanHerpesvirus 4, HumanToxocaraAIDS SerodiagnosisBlood DonorsOdds RatioDeath, Sudden, CardiacAntineoplastic AgentsLymphoma, Extranodal NK-T-CellCD4 Lymphocyte CountMultivariate AnalysisImmunoglobulin MPapillomavirus InfectionsSignal TransductionRural PopulationTumor Cells, CulturedB-LymphocytesBrazilAntibodies, MonoclonalMolecular Sequence DataHerpesvirus 8, HumanBlotting, WesternNeosporaImmunophenotypingCytomegalovirusImmunoglobulin AChromosomes, Human, Pair 14Cell ProliferationFlow Cytometry