Twins, DizygoticTwins, MonozygoticDiseases in TwinsGenetic DeterminismTwinsRegistriesChinaInheritance PatternsTwin Studies as TopicAsian Continental Ancestry GroupTwins, ConjoinedVietnam ConflictSwedenHeredityGenetics, BehavioralViverridaeEnvironmentDenmarkVirginiaRisk FactorsPrevalencePregnancy, TwinSocial EnvironmentGene-Environment InteractionGenotypeCohort StudiesGenetic Predisposition to DiseaseWeatherVeteransSevere Acute Respiratory SyndromeDengueHong KongSeasonsInfant, NewbornMolecular EpidemiologyAustraliaPoisson DistributionSex FactorsModels, GeneticDengue VirusCross-Sectional StudiesDiagnostic and Statistical Manual of Mental DisordersPhenotypeUnited StatesCluster AnalysisAge FactorsPhylogenyAlcoholismPregnancy, MultipleQuestionnairesSequence Analysis, DNAInfluenza, HumanIncidenceBody Mass IndexPregnancyFetofetal TransfusionRNA, ViralTreatment OutcomeRetrospective StudiesProspective StudiesFollow-Up StudiesTripletsTime Factors