1. Charm Vascular Clinic, Seoul, Korea
2. Division of Vascular and Transplant Surgery, Department of Surgery, The Catholic University of Korea, Seoul St. Mary’s Hospital, Seoul, Korea
3. Division of Vascular and Transplant Surgery, Department of Surgery, Chonnam National University Hospital, Gwangju, Korea
4. Division of Vascular and Transplant Surgery, Department of Surgery, Inha University Hospital, Inchon, Korea
5. Happy Varicose Vein Clinic, Seoul, Korea
6. Division of Vascular and Transplant Surgery, Department of Surgery, Jeonbuk National University Hospital, Jeonju, Korea
7. Department of Surgery, Soonchunhyang University Seoul Hospital, Seoul, Korea
8. Division of Vascular and Transplant, Department of Surgery, Inje University Seoul Paik Hospital, Seoul, Korea
9. Department of Thoracic and Cardiovascular Surgery, National Health Insurance Service Ilsan Hospital, Goyang, Korea
10. Division of Vascular and Transplant, Department of Surgery, Inje University Haeundae Paik Hospital, Busan, Korea
11. Purun Mac Clinic, Seoul, Korea