title: Limitations of direct immunoassays for measuring circulating estradiol levels in postmenopausal women and men in epidemiologic studies.
authors.affiliation: Department of Obstetrics and Gynecology, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, USA. fstanczyk@socal.rr.com
authors.forename: Frank Z
authors.initials: FZ
authors.lastname: Stanczyk
authors.forename: Jordan
authors.initials: J
authors.lastname: Jurow
authors.forename: Ann W
authors.initials: AW
authors.lastname: Hsing