title: Variation in couple fecundity and time to pregnancy, an essential concept in human reproduction.
authors.affiliation: Department of Fertility and Endocrinology, University Medical Center Utrecht, The Netherlands.
authors.forename: E R
authors.initials: ER
authors.lastname: te Velde
authors.forename: R
authors.initials: R
authors.lastname: Eijkemans
authors.forename: H D
authors.initials: HD
authors.lastname: Habbema
mesh_terms: D001723:Birth Rate; D005260:Female; D005298:Fertility; D005306:Fertilization; D006801:Humans; D008297:Male; D011247:Pregnancy; D013997:Time Factors