1. From the Department of Cardiology and CIBERCV, Hospital General Universitario Gregorio Marañón, Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM), Facultad de Medicina, Universidad Complutense, Madrid, Spain (P.Á., J.M.O., R.P., F.S., R.Y., F.F.-A.); Adult Congenital Heart Disease Unit, Hospital Universitario La Paz, Madrid, Spain (J.M.O., A.G.-G., E.C., J.R.-C., R.P.); and Intercenter Congenital Heart Disease Unit, Hospital Virgen del Rocío y Virgen Macarena, Sevilla, Spain (P.G., M.J.R...