1. Division of Gastroenterology, Department of Medicine; Kurume University School of Medicine; Kurume Japan
2. Department of Neuropsychiatry; Keio University School of Medicine; Tokyo Japan
3. Division of Hepatology, Department of Internal Medicine; Iwate Medical University; Morioka Japan
4. Morioka Municipal Hospital; Morioka Japan
5. Department of Nutritional Science; Morioka University; Takizawa Japan