1. Department of Gastroenterology, Ishikawa Prefectural Central Hospital, Kanazawa, Japan
2. Department of Diagnostic Pathology, Ishikawa Prefectural Central Hospital, Kanazawa, Japan
3. Department of Pathology, Fukuoka University Chikushi Hospital, Chikushino, Japan
4. Department of Endoscopy, Fukuoka University Chikushi Hospital, Chikushino, Japan