1. From the Department of Medical Imaging, Ottawa Hospital, 501 Smyth Rd, Ottawa, ON, Canada K1H 8L6 (D.V.F., K.S.R., Z.J.); Department of Radiology, Clínica Internacional, Lima, Peru (D.F.U.); and Department of Radiology, Clínica Alemana de Santiago, Vitacura, Chile (G.A.S.B.).