RT Journal Article SR Electronic T1 ‘A ring in the heart’ JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1953 OP 1953 DO 10.1136/heartjnl-2015-307738 VO 101 IS 24 A1 Thomas C Butler A1 Douglas Wall A1 Christian Hamilton-Craig YR 2015 UL http://heart.bmj.com/content/101/24/1953.abstract AB