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Giannopoulos G, Kossyvakis C, Vrachatis D, Aggeli C, Tsitsinakis G, Letsas K, Tsiachris D, Tsoukala S, Efremidis M, Katritsis D, et al. Effect of cryoballoon and radiofrequency ablation for pulmonary vein isolation on left atrial function in patients with nonvalvular paroxysmal atrial fibrillation: A prospective randomized study (Cryo-LAEF study). J Cardiovasc Electrophysiol. 2019;30(7):991-998.\par \par }