[1] Chinese Acad Med Sci & Peking Union Med Coll, Canc Hosp, Natl Clin Res Ctr Canc, Dept Radiat Oncol,Natl Canc Ctr, Beijing, Peoples R China
[2] Zhejiang Univ, Sch Med, Affiliated Hosp 1, Dept Radiat Oncol, Hangzhou, Peoples R China
[3] Chinese Acad Med Sci & Peking Union Med Coll, Canc Hosp, Natl Clin Res Ctr Canc, Dept VIP Med Serv & Radiat Oncol,Natl Canc Ctr, Beijing, Peoples R China