Original Contribution The Association of Endogenous Sex Steroids and Sex Steroid Binding Proteins with Mammographic Density: Results from the Postmenopausal Estrogen/Progestin Interventions Mammographic Density Study

1 Division of Geriatrics, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA. 2 Department of Public Health Sciences, Wake Forest University School of Medicine, Winston-Salem, NC. 3 Department of Preventive Medicine/Norris Comprehensive Cancer Center, University of Southern California Keck School of Medicine, Los Angeles, CA. 4 Department of Family and Preventive Medicine, University of California at San Diego, La Jolla, CA. 5 Division of General Internal Medicine and Health Sciences Research, David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, CA.