1. Cardiovascular Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
2. Phlebology Research Group, Shahid Beheshti University of Medical Sciences, Tehran, Iran
3. Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran
4. Division of Vascular & Endovascular Surgery, Department of General & Vascular Surgery, Tehran, Iran
5. Department of Radiology, Shohada-Tajrish Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran