1. Division of Gastroenterology, Department of Internal Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea
2. Catholic Photomedicine Research Institute, College of Medicine, The Catholic University of Korea
3. Division of Gastroenterology, Department of Internal Medicine, Eunpyeong St. Mary’s Hospital, College of Medicine, The Catholic University of Korea
4. Clinical Trial Center, Ewha Womans University Mokdong Hospital, Seoul, Korea