1. Graduate Collaborative Training Base of Academy of Military Medical Sciences, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China
2. Beijing Institute of Radiation Medicine, 27 Taiping Road, Beijing,1 00850,
China
3. Beijing Institute of Radiation Medicine, 27 Taiping Road, Beijing, 100850,
China
4. Department of Medical Imaging, Chinese PAP Beijing Corps Hospital, Beijing, 100600, China