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TwinsDiseases in TwinsTwins, MonozygoticTwins, ConjoinedTwins, DizygoticTwin Studies as TopicPregnancy, TwinChild WelfareDisabled ChildrenChild BehaviorChild Health ServicesChild RearingChild Behavior DisordersPregnancy, MultipleChild, InstitutionalizedChild PsychologyChild of Impaired ParentsDental Care for ChildrenPregnancyChild, OrphanedParentsChild Nutrition DisordersChild LanguageChild Nutritional Physiological PhenomenaFetofetal TransfusionInfant, NewbornChild MortalityMothersAge FactorsRisk FactorsPrevalenceParent-Child RelationsTripletsQuestionnairesCross-Sectional StudiesLongitudinal StudiesRetrospective StudiesProspective StudiesEnvironmentSocial EnvironmentFollow-Up StudiesBody HeightGestational AgeBirth WeightChild Development Disorders, PervasiveSex FactorsUnited StatesChild CustodyIntelligenceSocioeconomic FactorsPediatricsAsthmaFamilyPregnancy OutcomeTreatment OutcomePregnancy Reduction, MultifetalSchoolsMother-Child RelationsCase-Control StudiesTime FactorsAutistic DisorderFetal DeathChild, AbandonedPlay and PlaythingsAttention Deficit Disorder with HyperactivityRegistriesHospitals, PediatricAnthropometryIncidenceGene-Environment InteractionGenetics, BehavioralGrowth DisordersChild Nutrition SciencesChorionFathersLanguage DevelopmentFamily CharacteristicsUltrasonography, PrenatalRural PopulationSeverity of Illness IndexRegression AnalysisIntelligence TestsObesityLanguage Development DisordersBody Mass IndexGrowthDiarrheaAdoptionBody WeightDenmarkLogistic ModelsReference ValuesAnalysis of VarianceEnvironmental ExposureNutritional StatusUrban PopulationAid to Families with Dependent ChildrenTwinning, MonozygoticPovertyGenetic Predisposition to Disease