Application of a modified clinical classification for pulmonary arterial hypertension associated with congenital heart disease in children: emphasis on atrial septal defects and transposition of the great arteries. An analysis from the TOPP registry. - Wacker J; Humpl T; Berger RMF; Ivy D; Bowers D; Bonnet D; Beghetti M (Frontiers in cardiovascular medicine, 2024)