1. From the Department of Radiology and Imaging Sciences, Emory University School of Medicine, Emory University Hospital, 1365-A Clifton Rd NE, Suite AT-627, Atlanta, GA 30322 (H.R.B., A.S., A.H.D.); Department of Radiology, MedStar Georgetown University Hospital, Washington, DC (R.W.F.); and Department of Radiology, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran (A.R.R.).