1. Department of Radiology, Division of Cardiothoracic Radiology, University of Michigan, 1500 E Medical Center Dr, CVC Rm 5481, Ann Arbor, MI 48109-5868.
2. Center for Imaging Research, Medical College of Wisconsin, Milwaukee, WI.
3. Department of Medicine, Division of Cardiology, Loma Linda University Health, Loma Linda, CA.
4. Department of Medicine, Division of Cardiology, University of Michigan, Ann Arbor, MI.