1. Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
2. Institute of Gastroenterology, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
3. Center of Inflammatory Bowel Disease, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
4. Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea
5. Department of Severance Biomedical Science Institute, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea
6. Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea
7. Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, South Korea