1. Department of Pathology; Showa University Fujigaoka Hospital; Yokohama Kanagawa Japan
2. Department of Pathology; Showa University Hospital; Shinagawa Tokyo Japan
3. Division of Gastroenterology; Department of Internal Medicine; Showa University Fujigaoka Hospital; Yokohama Kanagawa Japan
4. Department of Gastroenterological and General Surgery; Showa University Fujigaoka Hospital; Yokohama Kanagawa Japan