title: Legislation of embryo transfer affected the denominator, not the numerator!
authors.affiliation: Centre for Reproductive Medicine, Meibergdreef 9, 1105 AZ AMC Amsterdam, The Netherlands.
authors.forename: I
authors.initials: I
authors.lastname: Scholten
authors.forename: E
authors.initials: E
authors.lastname: Kamphuis
authors.forename: B W J
authors.initials: BW
authors.lastname: Mol
mesh_terms: D005260:Female; D006801:Humans; D011247:Pregnancy; D011272:Pregnancy, Multiple / Q000706:statistics & numerical data*; D012042:Registries; D027724:Reproductive Techniques, Assisted / Q000331:legislation & jurisprudence*