RT Journal Article SR Electronic T1 Mitral balloon valvotomy and left atrial thrombus JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1088 OP 1089 DO 10.1136/hrt.2004.034959 VO 91 IS 8 A1 T R D Shaw A1 D B Northridge A1 N Sutaria YR 2005 UL http://heart.bmj.com/content/91/8/1088.abstract AB