1. Obstetrics and Gynecology Epidemiology Center, Department of Obstetrics, Gynecology and Reproductive Biology, Brigham and Women's Hospital; Harvard Medical School; Boston MA
2. Institute for Prevention and Cancer Epidemiology; University Medical Center Freiburg; Freiburg Germany
3. Clinical Breast Care Project; Henry M. Jackson Foundation for the Advancement of Military Medicine; Windber PA
4. Clinical Breast Care Project, Windber Research Institute; Windber PA
5. Clinical Breast Care Project, Walter Reed National Military Medical Center; Bethesda MD
6. Department of Epidemiology; Harvard School of Public Health; Boston MA