We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleChanges with age in the level and duration of fertility in the menstrual cycle.AuthorsDunson DB; Colombo B; Baird DDPublicationHuman reproduction (Oxford, England), 2002, Vol 17, Issue 5, p1399ISSN0268-1161Publication typearticleDOI10.1093/humrep/17.5.1399