1. Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea
2. Department of Internal Medicine, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea
3. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
4. Hanyang Institute of Bioscience and Biotechnology, Hanyang University, Seoul, Korea
5. Department of Internal Medicine, Pusan National University College of Medicine, Yangsan, Korea
6. Liver Center, Pusan National University Yangsan Hospital, Yangsan, Korea
7. Department of Internal Medicine, Chung-Ang University Hospital, Seoul, Korea
8. Division of Gastroenterology, Department of Internal Medicine, Wonkwang University Hospital, Wonkwang University College of Medicine, Iksan, Korea
9. Department of Information Statistics, Andong National University, Andong, Korea