PT - JOURNAL ARTICLE ED - BMJ Publishing Group Ltd and British Cardiovascular Society TI - PROCEEDINGS OF THE BRITISH CARDIAC SOCIETY AID - 10.1136/hrt.14.4.541 DP - 1952 Oct 01 TA - British Heart Journal PG - 541--546 VI - 14 IP - 4 4099 - http://heart.bmj.com/content/14/4/541.short 4100 - http://heart.bmj.com/content/14/4/541.full SO - Heart1952 Oct 01; 14