1. Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
2. Department of Gastroenterology and Hepatology, Kyoto Chubu Medical Center, Nantan, Japan
3. Department of Gastroenterology, Japanese Red Cross Society Kyoto Daiichi Hospital, Kyoto, Japan
4. Department of Gastroenterology and Hepatology, Fukuchiyama City Hospital, Fukuchiyama, Japan
5. Department of Surgical Pathology, Kyoto Prefectural University of Medicine, Kyoto, Japan