1. Program in Epidemiology, Division of Public Health Sciences; Fred Hutchinson Cancer Research Center; Seattle WA 98109
2. Obstetrics and Gynecology Epidemiology Center; Brigham and Women's Hospital and Harvard Medical School; Boston MA 02115
3. Department of Community and Family Medicine; Geisel School of Medicine at Dartmouth, Norris Cotton Cancer Center; NH 03755 Lebanon
4. Department of Epidemiology; Harvard T.H. Chan School of Public Health; Boston MA 02115