title: Temporal trends in multiple births after in vitro fertilisation in Sweden, 1982-2001: a register study.
authors.affiliation: Centre for Reproduction Epidemiology, Tornblad Institute, University of Lund, Biskopsgatan 7, S-223 62 Lund, Sweden. embryol@embryol.lu.se
authors.forename: Bengt
authors.initials: B
authors.lastname: Källén
authors.forename: Orvar
authors.initials: O
authors.lastname: Finnström
authors.forename: Karl Gösta
authors.initials: KG
authors.lastname: Nygren
authors.forename: Petra Otterblad
authors.initials: PO
authors.lastname: Olausson
mesh_terms: D015986:Confounding Factors, Epidemiologic; D005260:Female; D005307:Fertilization in Vitro / Q000706:statistics & numerical data*; D006801:Humans; D009099:Multiple Birth Offspring / Q000706:statistics & numerical data*; D016017:Odds Ratio; D011247:Pregnancy; D047928:Premature Birth / Q000453:epidemiology*; D012042:Registries; D013548:Sweden / Q000453:epidemiology