1. Department of Radiation Oncology, Shandong University Cancer Center, Jinan, Shandong 250117, P.R. China
2. School of Control Science and Engineering, Shandong University, Jinan, Shandong 250117
3. Department of Radiation Oncology, The Affiliated Cancer Hospital of Zhengzhou University (Henan Cancer Hospital), Zhengzhou, Henan 450000, P.R. China
4. Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
5. Department of Radiation Oncology, The Cancer Hospital of the University of Chinese Academy of Sciences, Zhejiang Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
6. Department of Radiation Oncology, Fujian Cancer Hospital, College of Clinical Medicine for Oncology, Fujian Medical University, Fuzhou, Fujian 350000, P.R. China
7. Department of Radiation Oncology, Zhangzhou Hospital Affiliated to Fujian Medical University, Zhangzhou, Fujian 363000, P.R. China
8. Department of Radiation Oncology, The Third Hospital Afiliated to Suzhou University, Changzhou, Jiangsu 213000, P.R. China