[1] Univ Elect Sci & Technol China, Sch Med, Chengdu, Peoples R China
[2] Univ Elect Sci & Technol China, Sch Med, Affiliated Canc Hosp, Sichuan Canc Hosp Res Inst, Chengdu, Peoples R China
[3] Univ Elect Sci & Technol China, Sch Med, Sichuan Canc Hosp & Inst,Sichuan Canc Ctr, Dept Radiat Oncol,Radiation Oncology Key Lab Sich, Chengdu, Peoples R China