PT - JOURNAL ARTICLE ED - , TI - ABSTRACTS OF CARDIOLOGY AID - 10.1136/hrt.18.4.571 DP - 1956 Oct 01 TA - British Heart Journal PG - 571--576 VI - 18 IP - 4 4099 - http://heart.bmj.com/content/18/4/571.short 4100 - http://heart.bmj.com/content/18/4/571.full SO - Heart1956 Oct 01; 18