TwinsDiseases in TwinsTwins, MonozygoticTwins, ConjoinedTwins, DizygoticProduct Recalls and WithdrawalsSalmonellaAphasia, BrocaSalmonella Food PoisoningSalmonella entericaTwin Studies as TopicFemoral Neck FracturesPregnancy, TwinPregnancy, MultipleMolecular Sequence DataBase SequenceFetofetal TransfusionKineticsPregnancyAmino Acid SequenceTripletsPregnancy Reduction, MultifetalEnvironmentGestational AgeFetal DeathChorionPregnancy OutcomeInfant, NewbornGenetics, BehavioralUltrasonography, PrenatalBirth WeightGene-Environment InteractionTwinning, MonozygoticSocial EnvironmentRegistriesFetoscopyQuadrupletsPolyhydramniosDenmarkDermatoglyphicsGenetic Predisposition to DiseaseReproductive Techniques, AssistedPhenotypeTwin StudySwedenBirth Order