1 Department of Radiology, Section of Vascular and Interventional Radiology, University of Washington, 1959 Northeast Pacific Street, Seattle, WA, 98195, USA.
2 The Deep Vein Institute, University of Washington, 1959 Northeast Pacific Street, Seattle, WA, 98195, USA.
3 Department of Radiology, Section of Vascular and Interventional Radiology, University of Wisconsin, 600 Highland Avenue, Madison, WI, 53792, USA.
4 Department of Radiology and Imaging Sciences, Division of Interventional Radiology and Image-Guided Medicine, 1405 Clifton Road, Atlanta, GA, 30322, USA.
5 Department of Radiology, Section of Vascular and Interventional Radiology, University of Washington, 1959 Northeast Pacific Street, Seattle, WA, 98195, USA. jeffreychick@gmail.com.
6 The Deep Vein Institute, University of Washington, 1959 Northeast Pacific Street, Seattle, WA, 98195, USA. jeffreychick@gmail.com.