[1] Vein Inst Toronto, Toronto, ON, Canada
[2] Peterborough Reg Hlth Ctr, Dept Radiol, Peterborough, ON, Canada
[3] Boston Healthcare Syst VAMC, Dept Radiol, Boston, MA USA
[4] Massachusetts Gen Hosp, Dept Radiol, Boston, MA 02114 USA
[5] Geisinger Hlth Syst, Danville, PA USA
[6] Washington Hosp Ctr, Dept Intervent Radiol, Bethesda, MD USA
[7] New York Presbyterian Hosp, Weill Cornell Med Ctr, Dept Radiol, New York, NY USA
[8] Univ Cincinnati Hosp, Dept Radiol, Cincinnati, OH USA
[9] Univ Illinois, Med Ctr, Dept Radiol, Cincinnati, OH USA
[10] Univ Illinois, Med Ctr, Dept Surg, Cincinnati, OH USA
[11] Vanderbilt Univ, Med Ctr, Dept Radiol & Radiol Sci, Nashville, TN 37232 USA
[12] Univ Texas MD Anderson Canc Ctr, Dept Intervent Radiol, Houston, TX 77030 USA
[13] Univ Roma La Sapienza, Dept Radiol Sci, Intervent Radiol Unit, Rome, Italy
[14] Las Palmas Gran Canaria Univ, Hospiten Rambla Hosp, Santa Cruz de Tenerife, Spain