1. Department of Internal Medicine, John H. Stroger Jr. Hospital of Cook County, Chicago, IL (M.S.K.).
2. Department of Internal Medicine, Dow University of Health Sciences, Karachi, Pakistan (S.M., K.F.).
3. Department of Internal Medicine, West Virginia University, Morgantown (S.U.K.).
4. Department of Radiology, Vancouver General Hospital, University of British Columbia, Canada (F.K.).
5. Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD (G.S., E.D.M.).