1. Department of Obstetrics and Gynecology, S.C.P.M.G.‐Fontana, Fontana, CA
2. Cancer Institute/Hospital, Chinese Academy Medical Sciences, Beijing, China
3. Department of Gynecology, The Cleveland Clinic Foundation, Cleveland, OH
4. Department of Research and Evaluation, S.C.P.M.G., Los Robles, CA
5. Department of Epidemiology, University of North Carolina, Chapel Hill, NC