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Zabalgoitia M, Halperin JL, Pearce LA, Blackshear JL, Asinger RW, Hart RG. Transesophageal echocardiographic correlates of clinical risk of thromboembolism in nonvalvular atrial fibrillation: Stroke Prevention in Atrial Fibrillation III Investigators. <i>J Am Coll Cardiol<\/i> 1998; 31: 1622\u20131626.","DOI":"10.1016\/S0735-1097(98)00146-6"},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. Klein AL, Murray RD, Grimm RA. Role of transesophageal echocardiography-guided cardioversion of patients with atrial fibrillation. <i>J Am Coll Cardiol<\/i> 2001; 37: 691\u2013704.","DOI":"10.1016\/S0735-1097(00)01178-5"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Scherr D, Dalal D, Chiluluri K, Dong J, Spargg D, Henrikson CA, et al. Incidence and predictors of left atrial thrombus prior to catheter ablation of atrial fibrillation. <i>J Cardiovasc Electrophysiol<\/i> 2009; 20: 379\u2013384.","DOI":"10.1111\/j.1540-8167.2008.01336.x"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. McCready JW, Nunn L, Lambiase PD, Ahsan SY, Segal OR, Rowland E, et al. Incidence of left atrial thrombus prior to atrial fibrillation ablation: Is pre-procedural transoesophageal echocardiography mandatory? <i>Europace<\/i> 2010; 12: 927\u2013932.","DOI":"10.1093\/europace\/euq074"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Puwanant S, Varr BC, Shrestha K, Hussain SK, Tang WH, Gabriel RS, et al. Role of the CHADS<sub>2<\/sub> score in the evaluation of thromboembolic risk in patients with atrial fibrillation undergoing transesophageal echocardiography before pulmonary vein isolation. <i>J Am Coll Cardiol<\/i> 2009; 54: 2032\u20132039.","DOI":"10.1016\/j.jacc.2009.07.037"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6. Nishikii-Tachibana M, Murakoshi N, Seo Y, Xu D, Yamamoto M, Ishizu T, et al. Prevalence and clinical determinants of left atrial appendage thrombus in patients with atrial fibrillation before pulmonary vein isolation. <i>Am J Cardiol<\/i> 2015; 116: 1368\u20131373.","DOI":"10.1016\/j.amjcard.2015.07.055"},{"key":"7","doi-asserted-by":"crossref","unstructured":"7. Schmidt H, von der Recke G, Illien S, Lewalter T, Schimpf R, Wolpert C, et al. Prevalence of left atrial chamber and appendage thrombi in patients with atrial flutter and its clinical significance. <i>J Am Coll Cardiol<\/i> 2001; 38: 778\u2013784.","DOI":"10.1016\/S0735-1097(01)01463-2"},{"key":"8","doi-asserted-by":"crossref","unstructured":"8. Wallace TW, Atwater BD, Daubert JP, Voora D, Crowley AL, Bahnson TD, et al. Prevalence and clinical characteristics associated with left atrial appendage thrombus in fully anticoagulated patients undergoing catheter-directed atrial fibrillation ablation. <i>J Cardiovasc Electrophysiol<\/i> 2010; 21: 849\u2013852.","DOI":"10.1111\/j.1540-8167.2010.01729.x"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Ruff CT, Giugliano RP, Braunwald E, Hoffman EB, Deenadayalu N, Ezekowitz MD, et al. Comparison of the efficacy and safety of new oral anticoagulants with warfarin in patients with atrial fibrillation: A meta-analysis of randomised trials. <i>Lancet<\/i> 2014; 383: 955\u2013962.","DOI":"10.1016\/S0140-6736(13)62343-0"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. Wu S, Yang YM, Zhu J, Wan HB, Wang J, Zhang H, et al. Meta-analysis of efficacy and safety of new oral anticoagulants compared with uninterrupted vitamin K antagonists in patients undergoing catheter ablation for atrial fibrillation. <i>Am J Cardiol<\/i> 2016; 117: 926\u2013934.","DOI":"10.1016\/j.amjcard.2015.12.027"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11. Connolly SJ, Ezekowitz MD, Yusuf S, Eikelboom J, Oldgren J, Parekh A, et al. Dabigatran versus warfarin in patients with atrial fibrillation. <i>N Engl J Med<\/i> 2009; 361: 1139\u20131151.","DOI":"10.1056\/NEJMoa0905561"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ. Validation of clinical classification schemes for predicting stroke: Results from the National Registry of Atrial Fibrillation. <i>JAMA<\/i> 2001; 285: 2864\u20132870.","DOI":"10.1001\/jama.285.22.2864"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Lip GY, Nieuwlaat R, Pisters R, Lane DA, Crijns HJ. Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation using a novel risk factor-based approach: The Euro Heart Survey on Atrial Fibrillation. <i>Chest<\/i> 2010; 137: 263\u2013272.","DOI":"10.1378\/chest.09-1584"},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Hori M, Matsumoto M, Tanahashi N, Momomura S, Uchiyama S, Goto S, et al. Rivaroxaban vs. warfarin in Japanese patients with atrial fibrillation: The J-ROCKET study. <i>Circ J<\/i> 2012; 76: 2104\u20132111.","DOI":"10.1253\/circj.CJ-12-0454"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Steinberg BA, Shrader P, Thomas L, Ansell J, Fonarow GC, Gersh BJ, et al. Off-label dosing of non-vitamin K antagonist oral anticoagulants and adverse outcomes: The ORBIT-AF II Registry. <i>J Am Coll Cardiol<\/i> 2016; 68: 2597\u20132604.","DOI":"10.1016\/j.jacc.2016.09.966"},{"key":"16","unstructured":"16. Lixana (edoxaban) [package insert]. Tokyo, Japan. Daiichi Sankyo Inc., 2015."},{"key":"17","doi-asserted-by":"crossref","unstructured":"17. Chilukuri K, Mayer SA, Scherr D, Dalal D, Abraham T, Henrikson CA, et al. Transoesophageal echocardiography predictors of periprocedural cerebrovascular accident in patients undergoing catheter ablation of atrial fibrillation. <i>Europace<\/i> 2010; 12: 1543\u20131549.","DOI":"10.1093\/europace\/euq295"},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. Camm AJ, Kirchhof P, Lip GY, Schotten U, Savelieva I, Ernst S, et al. Guidelines for the management of atrial fibrillation: The Task Force for the Management of Atrial Fibrillation of the European Society of Cardiology (ESC). <i>Eur Heart J<\/i> 2010; 31: 2369\u20132429.","DOI":"10.1093\/eurheartj\/ehq278"},{"key":"19","doi-asserted-by":"crossref","unstructured":"19. Frenkel D, D\u2019Amato SA, Al-Kazaz M, Markowitz SM, Liu CF, Thomas G, et al. Prevalence of left atrial thrombus detection by transesophageal echocardiography: A comparison of continuous non-vitamin K antagonist oral anticoagulant versus warfarin therapy in patients undergoing catheter ablation for atrial fibrillation. <i>JACC Clin Elestrophysiol<\/i> 2016; 2: 295\u2013303.","DOI":"10.1016\/j.jacep.2016.01.004"},{"key":"20","doi-asserted-by":"crossref","unstructured":"20. Da Costa A, Delolme C, Guichard JB, Gerbay A, Pierrard R, Romeyer-Bouchard C, et al. Comparison of prevalence and management of left atrial appendage thrombi under old and new anticoagulants prior to left atrial catheter ablation. <i>Am Heart J<\/i> 2017; 193: 8\u201315.","DOI":"10.1016\/j.ahj.2017.07.016"},{"key":"21","doi-asserted-by":"crossref","unstructured":"21. Bertaglia E, Anselmino M, Zorzi A, Russo V, Toso E, Peruzza F, et al. NOACs and atrial fibrillation: Incidence and predictors of left atrial thrombus in the real world. <i>Int J Cardiol<\/i> 2017; 249: 179\u2013183.","DOI":"10.1016\/j.ijcard.2017.07.048"},{"key":"22","doi-asserted-by":"crossref","unstructured":"22. Mitamura H, Nagai T, Watanabe A, Takatsuki S, Okumura K. Left atrial thrombus formation and resolution during dabigatran therapy: A Japanese Heart Rhythm Society report. <i>J Arrhythm<\/i> 2015; 31: 226\u2013231.","DOI":"10.1016\/j.joa.2014.12.010"},{"key":"23","doi-asserted-by":"crossref","unstructured":"23. Kawabata M, Goya M, Sasaki T, Maeda S, Shirai Y, Nishimura T, et al. Left atrial appendage thrombi formation in Japanese non-valvular atrial fibrillation patients during anticoagulation therapy: Warfarin vs. direct oral anticoagulants. <i>Circ J<\/i> 2017; 81: 645\u2013651.","DOI":"10.1253\/circj.CJ-16-1089"},{"key":"24","doi-asserted-by":"crossref","unstructured":"24. Calvo N, Mont L, Vidal B, Nadal M, Montserrat S, Andreu D, et al. Usefulness of transoesophageal echocardiography before circumferential pulmonary vein ablation in patients with atrial fibrillation: Is it really mandatory? <i>Europace<\/i> 2011; 13: 486\u2013491.","DOI":"10.1093\/europace\/euq456"},{"key":"25","doi-asserted-by":"crossref","unstructured":"25. Ammollo CT, Semeraro F, Incampo F, Semeraro N, Colucci M. Dabigatran enhances clot susceptibility to fibrinolysis by mechanisms dependent on and independent of thrombin-activatable fibrinolysis inhibitor. <i>J Thromb Haemost<\/i> 2010; 8: 790\u2013798.","DOI":"10.1111\/j.1538-7836.2010.03739.x"},{"key":"26","doi-asserted-by":"crossref","unstructured":"26. Morita S, Ajiro Y, Uchida Y, Iwade K. Dabigatran for left atrial thrombus. <i>Eur Heart J<\/i> 2013; 34: 2745.","DOI":"10.1093\/eurheartj\/eht148"},{"key":"27","doi-asserted-by":"crossref","unstructured":"27. Saito S, Tomita H, Kimura Y, Shiroto H, Hagii J, Metoki N, et al. 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