1. Department of Radiotherapy Cancer Center, Xuzhou First People's Hospital, Xuzhoug 221116, Jiangsu, China
2. Oncology Department, Ningxian Second People's Hospital of Qingyang City Gansu Province, Qingyang 745200, Gansu, China
3. Oncology Department, Feicheng Hospital of Shandong Guoxin Yiyang Group, Feicheng 271600, Shandong, China