1. Department of Radiation Oncology, Yonsei Cancer Center, Heavy Ion Therapy Research Institute, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Rehabilitation Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Biostatistics Collaboration Unit, Department of Biomedical Systems Informatics, Yonsei University College of Medicine, Seoul, Korea.