J Nielsen, P Jacobsen, M Mikkelsen, E Niebuhr, K Sorensen. Show Affiliations »
Abstract
Mesh: See more » Contraceptives, OralDenmarkDown Syndrome/epidemiologyEpidemiologic MethodsFemaleHumansMaleMaternal AgeRegistriesSeasonsSex RatioTime Factors
Substances: See more » Contraceptives, Oral
Year: 1981 PMID: 6460464
Source DB: PubMed Journal: Ann Genet ISSN: 0003-3995