1. Department of Radiation Oncology; School of Medicine, Institute of Health Science, Gyeongsang National University; JinJu Republic of Korea
2. Department of Radiation Oncology; Gyeongsang National University Hospital; Jinju Republic of Korea
3. Division of Heavy Ion Clinical Research; Korea Institute of Radiological and Medical Science; Seoul Republic of Korea
4. Department of Radiation Oncology; National Medical Center; Seoul Republic of Korea
5. Proton Therapy Center; National Cancer Center; Goyang Republic of Korea