1 Division of Interventional Radiology and Image-Guided Medicine, Department of Radiology and Imaging Sciences, Emory University Hospital, Atlanta, Georgia.
2 Division of Interventional Radiology, Department of Radiology, University of Vermont Medical Center, Burlington, Vermont.
3 Division of Vascular and Interventional Radiology, Department of Radiology, University of Utah Hospital, Salt Lake City, Utah.
4 Division of Cardiology, Mayo Clinic, Scottsdale, Arizona.