1 Adult Congenital Heart Disease Unit, Vall d'Hebron University Hospital, Barcelona, Spain; European Reference Network for Rare, Low-Prevalence, or Complex Diseases of the Heart (ERN GUARD-Heart), Germany.
2 Adult Congenital Heart Disease Unit, Vall d'Hebron University Hospital, Barcelona, Spain; European Reference Network for Rare, Low-Prevalence, or Complex Diseases of the Heart (ERN GUARD-Heart), Germany; CIBER de Enfermedades Cardiovasculares, Instituto de Salud Carlos III, Spain. Electronic address: laura_dos_subira@hotmail.com.