1. Department of Surgery National Defense Medical College Tokorozawa Japan
2. Department of Surgery JCHO Yokohama Hodogaya Central Hospital Hodogaya Japan
3. Department of Surgery Kindai University Nara Hospital Ikoma Japan
4. Department of Surgery Teikyo University Hospital, Mizonokuchi Kawasaki Japan
5. Department of Surgery Teikyo University School of Medicine Tokyo Japan
6. Tokyo Medical and Dental University Tokyo Japan