1. Department of Vascular Surgery, Saiseikai Yokohamashi Tobu Hospital
2. Department of Surgery, Keio University School of Medicine
3. Department of Surgery, The Jikei University Kashiwa Hospital
4. Department of Surgery, Shonan Kamakura General Hospital
5. Department of Surgery, Kawasaki Municipal Hospital
6. Department of Surgery, Saitama Municipal Hospital
7. Department of Surgery, Tokyo Medical and Dental University
8. Department of Surgery, The Jikei University School of Medicine
9. Division of Vascular Surgery, Saiseikai Central Hospital
10. Department of Vascular Surgery, Tsuchiura Kyodo General Hospital
11. Department of Preventive Medicine and Public Health, Keio University School of Medicine