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TwinsDiseases in TwinsTwins, MonozygoticTwins, ConjoinedTwins, DizygoticTwin Studies as TopicPregnancy, TwinPregnancy, MultipleLa Crosse virusFetofetal TransfusionPregnancyTripletsEnvironmentPregnancy Reduction, MultifetalGestational AgeFetal DeathPregnancy OutcomeChorionInfant, NewbornGenetics, BehavioralUltrasonography, PrenatalBirth WeightGene-Environment InteractionLanthanumTwinning, MonozygoticRegistriesSocial EnvironmentFetoscopyEncephalitis, CaliforniaQuadrupletsPolyhydramniosRibonucleoproteinsPhenotypeDenmarkGenetic Predisposition to DiseaseDermatoglyphicsReproductive Techniques, AssistedRisk FactorsAutoantigensTwin StudySwedenThioctic AcidBirth OrderFertilization in Vitro