1. Department of Radiation Oncology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, No. 44 Xiaoheyan Road, Dadong District, Shenyang, 110042 Liaoning, China
2. Department of Radiology, Suzhou Kowloon Hospital, Shanghai Jiaotong University School of Medicine, No. 118 Wansheng Street, Suzhou Industrial Park, Suzhou, 215028 Jiangsu, China