1. Department of Diagnostic Pathology; Kobe University Graduate School of Medicine; Kobe Japan
2. Department of Gastroenterology and Hepatology; Kobe City Medical Center West Hospital; Kobe Japan
3. Department of Pathology; Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
4. Department of Gastroenterology; Nagaoka Red Cross Hospital; Nagaoka Japan
5. Department of Surgery; Fukuiken Saiseikai Hospital; Fukui Japan
6. Department of Surgery; Toho University Ohashi Medical Center; Tokyo Japan
7. Department of Diagnostic Pathology; Tokai University Hachioji Hospital; Tokyo Japan