[1] Guangdong Med Coll, Affiliated Hosp, Dept Oncol, Zhanjiang 524001, Peoples R China
[2] Guangzhou Med Univ, Ctr Canc, Dept Radiotherapy, Guangzhou 510095, Guangdong, Peoples R China
[3] Guangdong Med Coll, Sch Basic Med Sci, Dept Pathophysiol, Dongguan 523808, Peoples R China
[4] Guangzhou Med Univ, Ctr Canc, Dept Chemotherapy, Guangzhou 510095, Guangdong, Peoples R China
[5] Guangdong Med Coll, Sch Publ Hlth, Dept Epidemiol & Hlth Stat, Zhanjiang 524023, Peoples R China