1. Electro-Medical Device Research Center, Korea Electrotechnology Research Institute, Ansan 15588, South Korea
2. Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, South Korea
3. RSS Center, Korea Electrotechnology Research Institute, Ansan 15588, South Korea
4. Department of Biomedicine and Health Sciences, The Catholic University of Korea, Seoul 06591, South Korea
5. Advanced Institute for Radiation Fusion Medical Technology, College of Medicine, The Catholic University of Korea, Seoul 06591, South Korea
6. Department of Radiation Oncology, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul 06591, South Korea
7. Department of Radiation Oncology, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Incheon 21431, South Korea
8. Department of Radiation Oncology, Eunpyeong St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul 03312, South Korea
9. Department of Radiation Oncology, Ajou University School of Medicine, Ajou University Hospital, Suwon 16499, South Korea