1. Program in Biomedical Radiation Sciences, Department of Transdisciplinary Studies Seoul National University Graduate School of Convergence Science and Technology Seoul 16229Republic of Korea
2. Department of Radiation Oncology Seoul National University Hospital Seoul 03080Republic of Korea
3. Institute of Radiation Medicine Seoul National University Medical Research Center Seoul 03080Republic of Korea
4. Biomedical Research Institute, Seoul National University Hospital Seoul 03080Republic of Korea
5. Robotics Research Laboratory for Extreme Environments Advanced Institutes of Convergence Technology Suwon 16229Republic of Korea