1. Department of Radiation Oncology, School of Medicine, Gyeongsang National University, Jinju, Republic of Korea
2. Department of Radiation Oncology, Gyeongsang National University Changwon Hospital, Changwon, Republic of Korea
3. Institute of Health Sciences, Gyeongsang National University, Jinju, Republic of Korea
4. Department of Radiation Oncology, Gyeongsang National University Hospital, Jinju, Republic of Korea
5. Department of Radiation Oncology, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea