Twins, MonozygoticDiseases in TwinsTwinsTwins, DizygoticTwinning, MonozygoticTwin Studies as TopicTwins, ConjoinedDermatoglyphicsTripletsQuadrupletsPregnancy, MultipleEnvironmentPregnancyMosaicismPhenotypeQuintupletsAbnormalities, MultiplePregnancy, TwinHeredityTurner SyndromeInfant, NewbornCombat DisordersGenetic Predisposition to DiseasePedigreeFetofetal TransfusionBlood Group AntigensVietnam ConflictDNA MethylationMononeuropathiesBirth WeightEpigenesis, GeneticFatigue Syndrome, ChronicEmbryo Transfer