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TwinsDiseases in TwinsTwins, MonozygoticTwins, ConjoinedTwins, DizygoticTramadolMotor Skills DisordersDecision Support TechniquesTwin Studies as TopicPregnancy, TwinPregnancy, MultipleFetofetal TransfusionPregnancyTripletsPregnancy Reduction, MultifetalEnvironmentGestational AgeFetal DeathChorionPregnancy OutcomeInfant, NewbornGenetics, BehavioralUltrasonography, PrenatalBirth WeightGene-Environment InteractionTwinning, MonozygoticSocial EnvironmentRegistriesFetoscopyQuadrupletsPolyhydramniosDenmarkDermatoglyphicsGenetic Predisposition to DiseaseReproductive Techniques, AssistedPhenotypeTwin StudySwedenBirth Order