title: Heterotopic pregnancy following in-vitro fertilization and embryo transfer. Two case reports and a review of the literature.
authors.affiliation: Department of Obstetrics and Gynaecology, City Hospital, Nottingham, UK.
authors.forename: A M
authors.initials: AM
authors.lastname: Lower
authors.forename: A J
authors.initials: AJ
authors.lastname: Tyack
mesh_terms: D000328:Adult; D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000209:etiology*