1. Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea
2. Cancer Research Institute, College of Medicine, Seoul National University, Seoul, Republic of Korea
3. Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Republic of Korea
4. Department of Radiation Oncology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Republic of Korea
5. Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul, Republic of Korea
6. Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
7. Department of Thoracic and Cardiovascular Surgery, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Republic of Korea