RT Journal Article SR Electronic T1 The role of echocardiography in atrial fibrillation and cardioversion JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1447 OP 1454 DO 10.1136/heart.89.12.1447 VO 89 IS 12 A1 Troughton, Richard W A1 Asher, Craig R A1 Klein, Allan L YR 2003 UL http://heart.bmj.com/content/89/12/1447.abstract AB