1. Department of Surgery Saiseikai Fukuoka General Hospital Fukuoka Japan
2. Department of Surgery Matsuyama Red Cross Hospital Matsuyama Japan
3. Department of Surgery and Science, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
4. Department of Anatomic Pathology and Pathological Sciences Matsuyama Red Cross Hospital Matsuyama Japan
5. Department of gastroenterology Matsuyama Red Cross Hospital Matsuyama Japan