1. Department of Pathology; Shinshu University School of Medicine; Matsumoto Japan
2. Department of Pathology; Saku Central Hospital Advanced Care Center; Saku Japan
3. Department of Pathology; Nagano Red Cross Hospital; Nagano Japan
4. Department of Digestive Surgery; Saku Central Hospital Advanced Care Center; Saku Japan
5. Department of Gastroenterological Surgery; Nagano Red Cross Hospital; Nagano Japan
6. Department of Gastroenterology; Nagano Red Cross Hospital; Nagano Japan