1. From the Department of Radiology, Brooke Army Medical Center, 3551 Roger Brooke Dr, San Antonio, TX 78219 (M.G., J.G.P., M.N.C., K.P.B.); Department of Radiology, 10th Medical Group, U.S. Air Force Academy, Colo (J.A.A.); Mountain Medical Physician Specialists, Salt Lake City, Utah (S.B.A.); and Uniformed Services University of the Health Sciences, Bethesda, Md (M.N.C., K.P.B.).