1. From the Division of Cardiology (D.J.A., M.A.C., T.A.B.), University of Florida, Shands Jacksonville; Cardiovascular Institute (A.F.-O., E.B., C.R., M.S., R.H., R.M., J.E., F.A., C.B., C.M.), San Carlos University Hospital, Madrid, Spain; and the Department of Mother and Child & Biology-Genetics (U.C., E.T., P.F.), University of Verona, Italy.