1. Tarao's Gastroenterological Clinic, Japan
2. Department of Gastroenterology, Kanagawa Cancer Center Hospital, Japan
3. Research Institute, Kanagawa Cancer Center, Japan
4. Yokohama National University, Center for Health Service Sciences, Japan
5. Department of Pathology, Kanagawa Cancer Center Hospital, Japan
6. Department of Pathology, Kitasato University School of Medicine, Japan