1. Department of Radiation Oncology, Eunpyeong St. Mary’s Hospital, Catholic University of Korea College of Medicine, Seoul 06591, Republic of Korea
2. Division of Medical Oncology, Department of Internal Medicine, Eunpyeong St. Mary’s Hospital, Catholic University of Korea College of Medicine, Seoul 06591, Republic of Korea
3. Department of Radiation Oncology, Incheon St. Mary’s Hospital, Catholic University of Korea College of Medicine, Seoul 06591, Republic of Korea
4. Department of Surgery, Incheon St. Mary’s Hospital, The Catholic University of Korea, Seoul 06591, Republic of Korea