1. West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China
2. School of Radiation Medicine and Protection, Soochow University, Suzhou, Jiangsu 215123, P.R. China
3. Department of Surgery, Second Affiliated Hospital of Chengdu Medical College, China National Nuclear Corporation 416 Hospital, Chengdu, Sichuan 610051, P.R. China