[1] Chinese Acad Med Sci & Peking Union Med Coll, Natl Canc Ctr, Natl Clin Res Ctr Canc, Canc Hosp, Beijing 100021, Peoples R China
[2] NCI, Canc Prevent Div, Bethesda, MD 20892 USA
[3] Hunan Canc Hosp, Dept Canc Prevent & Control, Changsha, Hunan, Peoples R China
[4] Gansu Canc Hosp, Dept Canc Epidemiol, Lanzhou, Gansu, Peoples R China
[5] Zhejiang Canc Hosp, Dept Canc Prevent, Hangzhou, Zhejiang, Peoples R China