1. Department of Radiation Oncology, Chonnam National University Hwasun Hospital, Hwasun‑gun, Jeollanam‑do 58128, Republic of Korea
2. Department of Radiation Oncology, Dongnam Institute of Radiological and Medical Sciences, Gijang‑gun, Busan 46033, Republic of Korea
3. Department of Internal Medicine, Chonnam National University Hwasun Hospital, Hwasun‑gun, Jeollanam‑do 58128, Republic of Korea