1. Department of Oncology, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510280, P.R. China
2. Department of Radiotherapy, The Affiliated People's Hospital of Inner Mongolia Medical University, Hohhot, Inner Mongolia 010017, P.R. China
3. Department of Basic Medicine, Xiangnan University, Chenzhou, Hunan 423000, P.R. China
4. Department of Hematology and Oncology, Yan'an People's Hospital, Yan'an, Shaanxi 716000, P.R. China