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Sorgente A, Chierchia GB, de Asmundis C, Sarkozy A, Namdar M, Capulzini L, et al. Pulmonary vein ostium shape and orientation as possible predictors of occlusion in patients with drug-refractory paroxysmal atrial fibrillation undergoing cryoballoon ablation. <i>Europace<\/i> 2011; 13: 205\u2013212.","DOI":"10.1093\/europace\/euq388"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Schmidt M, Dorwarth U, Straube F, Daccarett M, Rieber J, Wankerl M, et al. Cryoballoon in AF ablation: Impact of PV ovality on AF recurrence. <i>Int J Cardiol<\/i> 2013; 167: 114\u2013120.","DOI":"10.1016\/j.ijcard.2011.12.017"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6. Knecht S, K\u00fchne M, Altmann D, Ammann P, Schaer B, Osswald S, et al. 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