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TwinsDiseases in TwinsTwins, MonozygoticTwins, ConjoinedTwins, DizygoticTwin Studies as TopicPregnancy, TwinPregnancy, MultipleFetofetal TransfusionPregnancyTripletsBase SequenceEnvironmentMolecular Sequence DataPregnancy Reduction, MultifetalGestational AgeBase PairingInfant, NewbornFetal DeathChorionPregnancy OutcomeGenetics, BehavioralBirth WeightUltrasonography, PrenatalGene-Environment InteractionModels, GeneticPair BondTwinning, MonozygoticSocial EnvironmentRegistriesPhenotypeDNAFetoscopySiblingsGenetic Predisposition to DiseaseNucleic Acid ConformationBase Pair MismatchQuadrupletsAmino Acid SequenceDenmarkDermatoglyphicsPolyhydramniosRisk FactorsReproductive Techniques, AssistedSwedenCohort StudiesGenetic VariationBirth OrderBase CompositionInheritance PatternsTwin Study