1. Department of Gastroenterology and Hepatology, Graduate School of Medical ScienceKyoto Prefectural University of Medicine Kyoto Japan
2. Department of Gastroenterology and HepatologyJapanese Red Cross Society Kyoto Daiichi Hospital Kyoto Japan
3. Department of Gastroenterology and HepatologyNorth Center of Kyoto Prefectural University of Medicine Kyoto Japan
4. Division of Gastroenterology, Department of Internal MedicineKawasaki Medical School Kurashiki Japan