1. National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, Seoul, Korea.
2. Department of Radiation Oncology, Korea Institute of Radiological and Medical Sciences, Seoul, Korea.
3. Department of Pathology, Korea Institute of Radiological and Medical Sciences, Seoul, Korea.
4. National Cancer Control Institute, National Cancer Center, Goyang, Korea.
5. Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Korea.