title: [A global report on fertilization in vitro. Every fourth woman delivers twins].
authors.affiliation: Fertiliseringscentrum, Carlanderska siukhemmet, Göteborg.
authors.forename: K G
authors.initials: KG
authors.lastname: Nygren
authors.forename: M
authors.initials: M
authors.lastname: Wikland
mesh_terms: D005260:Female; D005307:Fertilization in Vitro / Q000009:adverse effects*; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012307:Risk Factors; D014427:Twins