1. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
2. Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Korea
3. Department of Pathology, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
4. Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Gyeongsang National University College of Medicine, Jinju, Gyeongsangnam-do, Korea
5. Department of Physiology and Institute of Wonkwang Medical Science, Wonkwang University College of Medicine, Iksan, Jeollabuk-do, Korea
6. Division of Gastroenterology and Wonkwang Digestive Disease Research Institute, Department of Internal Medicine, Wonkwang University Sanbon Hospital, Gunpo, Gyeonggi-do, Korea