1. Janssen Korea Ltd., Seoul, Korea
2. Department of Biostatistics and Computing, Yonsei University College of Medicine, Seoul, Korea
3. Division of Gastroenterology, Department of Internal Medicine, St. Vincent Hospital, The Catholic University of Korea College of Medicine, Suwon, Korea
4. Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Korea
5. Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea
6. Departmentof Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea
7. Division of Gastroenterology, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
8. Catholic Photomedicine Research Institute, Seoul, Korea