1. From the Departments of Radiology (L.A., F.U.K., E.A.Z., J.D.B., N.M.R., S.A.) and Internal Medicine (E.S.C.), UT Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390; and Division of Hospital Medicine (E.S.C.) and Chief Medical Officer (J.C.), Parkland Health, Dallas, Tex.