THE PREVALENCE OF LEFT ATRIAL APPENDAGE THROMBUS IN PATIENTS UNDERGOING CATHETER ABLATION FOR ATRIAL FIBRILLATION MAINTAINED ON WARFARIN - Herring, N; Page, S; Ahmed, M; Burg, M; Hunter, R; Earley, M; Sporton, S; Bashir, Y; Betts, T; Schilling, R; Rajappan, K (2012)