1. Ochanomizu Vascular and Vein Clinic
2. Department of Vascular Surgery, International University of Health and Welfare Mita Hospital
3. Department of Cardiovascular Surgery, Yokohama Minami Kyosai Hospital
4. Department of Cardiovascular Surgery, Asahikawa Medical University
5. Tsukuba Vascular Center
6. Department of Cardiovascular Surgery, Kanazawa Medical University Himi Municipal Hospital
7. Department of Cardiovascular Surgery, Yuuai Medical Center
8. Department of Cardiovascular Surgery, Nagano Matsushiro General Hospital
9. Department of Vascular Surgery, The University of Tokyo
10. Takeuchi Vascular Clinic
11. Department of Cardiovascular Surgery, Fukuoka Wajiro Hospital
12. Department of Medical Management and Informatics, Hokkaido Information University
13. Department of Vascular Surgery, Tokyo Metropolitan Tama Medical Center
14. Department of Vascular Surgery, International University of Health and Welfare Narita Hospital
15. Varicose Vein Treatment Center, The Second Kawasaki Saiwai Clinic
16. Department of Cardiovascular Surgery, Kyorin University
17. Department of Vascular Surgery, Kansai Medical University Medical Center
18. Department of General Medicine, Kawasaki Medical School