1. Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
2. Department of Gastroenterology, Nara City Hospital, Nara, Japan
3. Department of Gastroenterology and Hepatology, Japanese Red Cross Society Kyoto Daiichi Hospital, Kyoto, Japan
4. Department of Gastroenterology and Hepatology, Saiseikai Suita Hospital, Suita-City, Japan
5. Department of Gastroenterology, Aiseikai Yamashina Hospital, Kyoto, Japan
6. Department of Gastroenterology, Osaka General Hospital of West Japan Railway Company, Osaka, Japan
7. Department of Surgical Pathology, Kyoto Prefectural University of Medicine, Graduate School of Medical Science, Kyoto, Japan