[1] Chinese Acad Med Sci, Dept Canc Epidemiol, Natl Canc Ctr, Natl Clin Res Ctr Canc,Canc Hosp, 17 South Pan Jia Yuan Lane, Beijing 100021, Peoples R China
[2] Peking Union Med Coll, 17 South Pan Jia Yuan Lane, Beijing 100021, Peoples R China
[3] Chinese Acad Med Sci, Sch Publ Hlth, Beijing, Peoples R China
[4] Capital Med Univ, Beijing Maternal & Child Hlth Care Hosp, Beijing Obstet & Gynecol Hosp, Dept Womens Hlth Care, 251 Yao Jia Yuan Rd, Beijing 100026, Peoples R China
[5] Chinese Acad Med Sci, Sch Humanities & Social Sci, Beijing, Peoples R China