1. Department of Radiology, University of Maryland School of Medicine, 22 S Green St, Baltimore, MD 21201
2. Department of Cardiovascular and Thoracic Surgery, Hôtel-Dieu de France Hospital, Beirut, Lebanon
3. Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA
4. Department of Cardiology, University of Maryland School of Medicine, Baltimore, MD