1. Department of Internal Medicine, Myoungji Hospital, Hanyang University College of Medicine, Goyang-si, Gyeonggi-do, Republic of Korea
2. Graduate School, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
3. Division of Gastroenterology and Hepatology, Department of Internal Medicine, College of Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea
4. Catholic Photomedicine Research Institute, Seoul, Republic of Korea
5. Department of Health Promotion Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea