1. From the Instituto Cardiovascular, Hospital General Universitatio de Valencia, Valencia, Spain (R.R.), and Children’s National Medical Center (M.C.S.) and Interventional Cardiology, Washington Hospital Center (R.W., I.B.-D., L.F.S., K.M.K., S.G., Z.W., P.C., N.B., W.O.S., A.D.P.), Washington, DC.