1. Department of Radiology and Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, Republic of Korea.
2. Department of Internal Medicine and Institute of Gastroenterology, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.
3. Department of Biomedical Systems Informatics, Biostatistics Collaboration Unit, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.