Garatachea, Nuria Echevarría-Polo, Marcos Hernández-Vicente, Adrián D'Ascenzi, Flavio Fabregat-Andrés, Óscar Grazioli, Gonzalo de la Guía-Galipienso, Fernando Sanchis-Gomar, Fabian Cardiac magnetic resonance tissue characterization in endurance athletes with paroxysmal atrial fibrillation phenotype (PAFIYAMA) Int. j. cardiol. 10.1016/j.ijcard.2026.134502 2026 2026