Institution: | 1. Department of Cancer Epidemiology, Cancer Institute, Chinese Academy of Medical Sciences, Beijing 100021, China;2. Hormonal and Reproductive Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, 20892 MD, USA;3. Liaoning Provincial Tumor Hospital, Shenyang 110042, China;4. Xiangyuan Women and Children''s Hospital, Shanxi Province 046200, China;5. Department of OB/GYN, Peking University People''s Hospital, Beijing 100044, China;6. Department of OB/GYN, Xinjiang Uygur Autonomous Region Hospital, Urumchi 830001, China;g Xinmi Women and Children''s Hospital, Henan Province 452300, China;h Hongkou District Women and Children''s Hospital, Shanghai 200082, China;i Department of OB/GYN, the Cleveland Clinic Foundation, OH 44195, USA |