1. Department of Surgery, Pippu Clinic, Pippu Town, Japan
2. Department of Surgery, Asahikawa Medical Center, Asahikawa, Japan
3. Department of Surgery, Hokuyu Hospital, Sappro, Japan
4. Department of Surgery, Nihon University, Tokyo, Japan
5. Department of Internal Medicine, Okayaka University, Okayama, Japan
6. Department of Surgery, Asahikwa Medical College, Asahikawa, Japan