[1] Chinese Acad Med Sci, Natl Canc Ctr, Canc Hosp, Med Oncol Dept, Beijing, Peoples R China
[2] Gansu Prov Canc Hosp, Dept Radiotherapy, Lanzhou, Peoples R China
[3] Gansu Prov Canc Hosp, Head & Neck Serv, Lanzhou, Peoples R China
[4] Cent South Univ, Xiangya Med Sch, Hunan Canc Hosp, Dept Thorac Surg 1, Changsha, Peoples R China
[5] Peking Union Med Coll Hosp, Dept Med Oncol, Beijing, Peoples R China
[6] Zhengzhou Univ, Affiliated Hosp 1, Oncol Dept, Zhengzhou, Peoples R China
[7] Fourth Mil Med Univ, Tangdu Hosp, Oncol Dept, Xian, Peoples R China
[8] Sun Yat Sen Univ, Affiliated Hosp 5, Ctr Oncol, Dept Head & Neck Serv, Guangzhou, Peoples R China