1. Division of Vascular Surgery, Department of Surgery, Tohoku University Hospital, Sendai, Miyagi, Japan
2. Ochanomizu Vascular and Vein Clinic, Tokyo, Japan
3. Division of Vascular Surgery, Stanford University School of Medicine, Palo Alto, CA, USA
4. Vascular and Endovascular Surgery, Fukuoka Wajiro Hospital, Fukuoka, Fukuoka, Japan
5. Matsusaka Ohta Clinic, Matsusaka, Mie, Japan
6. Department of Medical Management and Informatics, Hokkaido Information University, Ebetsu, Hokkaido, Japan
7. Department of Surgery, Yokohama City University, Yokohama, Kanagawa, Japan
8. Japanese Regulatory Committee for Endovascular Treatment of Varicose Veins, Tokyo, Japan