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Collier P, Cavalcante JL, Phelan D, <i>et al<\/i>. Congenital absence of the left atrial appendage. Circ Cardiovasc Imaging 2012; 5: 549-50."},{"key":"2","unstructured":"2. Di Gioia G, Mega S, Visconti S, <i>et al<\/i>. Congenital absence of left atrial appendage in a patient with intracranial hemorrhage. Am J Case Rep 2015; 16: 514-6."},{"key":"3","unstructured":"3. Zhang ZJ, Dong JZ, Ma CS. Congenital absence of the left atrial appendage: a rare anatomical variation with clinical significance. Acta Cardiol 2013; 68: 325-7."},{"key":"4","first-page":"1206","volume":"32","year":"2015","unstructured":"4. Saleh M, Balakrishnan R, Kontak LC, <i>et al<\/i>. Congenital absence of the left atrial appendage visualized by 3D echocardiography in two adult patients. Echocardiography 2015; 32: 1206-10.","journal-title":"Echocardiography","ISSN":"https:\/\/id.crossref.org\/issn\/0742-2822","issn-type":"print"},{"key":"5","unstructured":"5. Di Biase L, Burkhardt JD, Mohanty P, <i>et al<\/i>. Left atrial appendage isolation in patients with longstanding persistent AF undergoing catheter ablation: BELIEF trial. J Am Coll Cardiol 2016; 68: 1929-40."},{"key":"6","unstructured":"6. Reddy VY, Doshi SK, Sievert H, <i>et al<\/i>. Percutaneous left atrial appendage closure for stroke prophylaxis in patients with atrial fibrillation 2.3-year follow-up of the PROTECT AF (Watchman left atrial appendage system for embolic protection in patients with atrial fibrillation) trial. Circulation 2013; 127: 720-9."},{"key":"7","unstructured":"7. Al-Saady NM, Obel OA, Camm AJ. Left atrial appendage: Structure, function, and role in thromboembolism. Heart 1999; 82: 547-55."},{"key":"8","unstructured":"8. Stoddard MF, Dawkins PR, Prince CR, Ammash NM. Left atrial appendage thrombus is not uncommon in patients with acute atrial fibrillation and a recent embolic event: a transesophageal echocardiographic study. J Am Coll Cardiol 1995; 25: 452-9."},{"key":"9","unstructured":"9. Sakr SA, El-Rasheedy WA, Ramadan MM, El-Menshawy I, Mahfouz E, Bayoumi M. Association between left atrial appendage morphology evaluated by trans-esophageal echocardiography and ischemic cerebral stroke in patients with atrial fibrillation. Int Heart J 2015; 56: 329-34."},{"key":"10","unstructured":"10. Verma A, Wazni OM, Marrouche NF, <i>et al<\/i>. Pre-existent left atrial scarring in patients undergoing pulmonary vein antrum isolation: an independent predictor of procedural failure. J Am Coll Cardiol 2005; 18:45: 285-92."},{"key":"11","first-page":"1000","volume":"6","year":"2009","unstructured":"11. Roberts-Thomson KC, John B, Worthley SG, <i>et al<\/i>. Left atrial remodeling in patients with atrial septal defects. 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