1. Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
2. Department of Anesthesia, Critical Care, and Pain Management, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
3. Department of Radiology, UCLA Medical Center, Los Angeles, CA, USA
4. Department of Radiology, Mayo Clinic, Jacksonville, FL, USA
5. Colorado School of Public Health, Aurora, Colorado, USA
6. The Inflammatory Bowel Disease Center at Columbia, Columbia University Irving Medical Center, New York, NY, USA
7. Division of Vascular and Interventional Radiology, Imaging Institute, Cleveland Clinic, Cleveland, OH, USA