1. Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea.
2. Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea.
3. Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea.
4. Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea.
5. Robotics Research Laboratory for Extreme Environments, Advanced Institutes of Convergence Technology, Suwon, Korea.