title: Older age, infertility, and multiple pregnancies.
authors.forename: Wendy
authors.initials: W
authors.lastname: Chavkin
authors.forename: Blair
authors.initials: B
authors.lastname: Johnson
mesh_terms: D005260:Female; D006801:Humans; D007247:Infertility, Female; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011634:Public Health; D027724:Reproductive Techniques, Assisted