title: Reply of the authors.
authors.affiliation: Washington University, St. Louis, Missouri.
authors.forename: Christina E
authors.initials: CE
authors.lastname: Boots
authors.affiliation: Colorado Center for Reproductive Medicine, Denver, Colorado.
authors.forename: Robert L
authors.initials: RL
authors.lastname: Gustofson
authors.affiliation: NorthShore University Health System, Fertility Centers of Illinois, Highland Park, Illinois.
authors.forename: Eve C
authors.initials: EC
authors.lastname: Feinberg
mesh_terms: D005260:Female; D006801:Humans; D007247:Infertility, Female / Q000453:epidemiology* / Q000628:therapy*; D008727:Methotrexate / Q000008:administration & dosage*; D010060:Ovulation / Q000187:drug effects*; D011247:Pregnancy; D018873:Pregnancy Rate; D011271:Pregnancy, Ectopic / Q000453:epidemiology* / Q000517:prevention & control*
chemical_list: D008727:Methotrexate