1. Society for Vascular Medicine, Deerfield, IL, USA
2. University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
3. Department of Biostatistics and Epidemiology, University of Oklahoma Health Sciences Center
4. American College of Phlebology, San Leandro, CA, USA
5. Society for Interventional Radiology, Fairfax, VA, USA
6. American Venous Forum, Milwaukee, WI, USA