1. Department of Gastroenterology, Sapporo Kosei General Hospital, Hokkaido, Japan
2. Division of Gastroenterology and Hepatology, Musashino Red Cross Hospital, Tokyo, Japan
3. Division of Frontier Medical Science, Department of Medical and Molecular Science, Programs for Biomedical Research, Graduate School of Biomedical Science, Hiroshima University, Hiroshima, Japan
4. Research and Development Division, Mitsubishi Tanabe Pharma Corporation, Tokyo, Japan
5. Department of Hepatology, Toranomon Hospital, Tokyo, Japan