1. Department of Radiation Oncology, China Medical University Hospital, Taichung, Taiwan
2. Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei, Taiwan
3. Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung, Taiwan
4. Department of Radiation Oncology, Taoyuan Armed Forces General Hospital, Taoyuan, Taiwan
5. Department of Radiation Oncology, Taipei Medical University-associated Wan-Fang Hospital, Taipei, Taiwan
6. Department of Radiation Protection, Atomic Energy Council, Taipei, Taiwan
7. Department of Radiation Oncology, Taipei Medical University Hospital, Taipei, Taiwan
8. Department of Radiation Oncology, Taichung Veterans General Hospital, Taichung, Taiwan
9. Department of Medicine, China Medical University, Taichung, Taiwan