Multiple Birth OffspringPregnancy, MultipleTwinsDiseases in TwinsTwins, MonozygoticPregnancyTwins, ConjoinedBibliometricsTwins, DizygoticJournal Impact FactorPeriodicals as TopicPublicationsPublishingDatabases, BibliographicTwin Studies as TopicMEDLINEAuthorshipAbstracting and Indexing as TopicPubMedPregnancy, TwinMedical Subject HeadingsBibliography as TopicPeer Review, ResearchJournalism, MedicalBiomedical ResearchInformation Storage and RetrievalGovernment Publications as TopicEditorial PoliciesScienceReference BooksBiobibliography as TopicBooksEncyclopedias as TopicPlagiarismResearch PersonnelResearchReview Literature as TopicSubject HeadingsMEDLARSBloggingPeer ReviewJournalismNobel PrizeNational Library of Medicine (U.S.)Retraction of Publication as TopicRandomized Controlled Trials as TopicLibraries, MedicalPhysics