Twins, MonozygoticDiseases in TwinsTwinsTwins, DizygoticTwinning, MonozygoticTwins, ConjoinedTwin Studies as TopicDermatoglyphicsTripletsPregnancy, MultiplePregnancy, TwinQuadrupletsEnvironmentPregnancyPhenotypeMosaicismFetofetal TransfusionQuintupletsAbnormalities, MultipleHeredityInfant, NewbornGenetic Predisposition to DiseaseTurner SyndromeCombat DisordersPedigreeVietnam ConflictBirth WeightBlood Group AntigensDNA MethylationEmbryo TransferMononeuropathies