1. Division of Gastro-intestinal Surgery, Department of Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
2. Department of Surgery, Yodogawa Christian Hospital, Osaka, Japan
3. Department of Surgery, Kita-Harima Medical Center, Ono, Japan
4. Division of Pathology, Kobe University Graduate School of Medicine, Kobe, Japan
5. Division of Diagnostic Pathology, Department of Pathology, Kobe University Graduate School of Medicine, Kobe, Japan