We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleHormone-related risk factors and postmenopausal breast cancer among nulliparous versus parous women: An aggregated study.AuthorsSchonfeld SJ; Pfeiffer RM; Lacey JV Jr; Berrington de González A; Doody MM; Greenlee RT; Park Y; Schairer C; Schatzkin A; Sigurdson AJ; Hartge P; Visvanathan KPublicationAmerican journal of epidemiology, 2011, Vol 173, Issue 5, p509ISSN1476-6256Publication typearticleDOI10.1093/aje/kwq404