1. Division of Interventional Radiology, Washington University School of Medicine in St. Louis, St. Louis, MO, USA

2. Mallinckrodt Institute of Radiology and Biostatistics and Department of Neurology, Washington University School of Medicine in St. Louis, St. Louis, MO, USA

3. Division of Interventional Radiology, University of Alabama at Birmingham, Birmingham, AL, USA

4. Division of Interventional Radiology, Department of Radiology, The Johns Hopkins University School of Medicine, Baltimore, USA