1. Department of Internal Medicine, Konkuk University School of Medicine, Seoul, Korea
2. Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
3. Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
4. Department of Pathology, Konkuk University School of Medicine, Seoul, Korea
5. Department of Surgical Pathology, Kyoto Prefectural University of Medicine, Kyoto, Japan