1. Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
2. School of Electrical Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
3. Department of Software Convergence, College of Interdisciplinary Studies for Emerging Industries, 621 Hwarang-ro, Nowon-gu, Seoul 01797, Republic of Korea