1. Division of Gastroenterology and Hepatology; Niigata University Medical and Dental Hospital; Niigata Japan
2. Division of Gastroenterology and Hepatology; Saiseikai Niigata Daini Hospital; Niigata Japan
3. Division of Cellular and Molecular Pathology; Department of Cellular Function; Niigata University Graduate School of Medical and Dental Sciences; Niigata Japan