1. From the Department of Radiology, UC San Diego Medical Center, 200 W Arbor Dr, San Diego, CA 92103 (M.J.H., S.J.K., A.H.); Division of Cardiology (D.F.K., L.A.) and Department of Pediatrics, Division of Cardiology (H.G.E.), UC San Diego, La Jolla, Calif; and Division of Cardiology, UC Los Angeles Health, Los Angeles, Calif (D.F.K.).