[1] Chinese Acad Med Sci & Peking Union Med Coll, Dept Canc Epidemiol, Natl Canc Ctr, Natl Clin Res Ctr Canc,Canc Hosp, Beijing, Peoples R China
[2] Kunming Med Univ, Dept Gynaecol & Obstet, Affiliated Hosp 1, Kunming, Yunnan, Peoples R China
[3] Third Peoples Hosp Kunming, Dept Obstet & Gynaecol, Kunming, Yunnan, Peoples R China
[4] Third Peoples Hosp Kunming, Dept Infect Dis, Kunming, Yunnan, Peoples R China
[5] Int Agcy Res Canc, Lyon, France