PT - JOURNAL ARTICLE ED - , TI - ABSTRACTS OF CARDIOLOGY AID - 10.1136/hrt.11.3.298 DP - 1949 Jul 01 TA - British Heart Journal PG - 298--304 VI - 11 IP - 3 4099 - http://heart.bmj.com/content/11/3/298.short 4100 - http://heart.bmj.com/content/11/3/298.full SO - Heart1949 Jul 01; 11