PT - JOURNAL ARTICLE ED - , AID - 10.1136/heart.85.4.462 DP - 2001 Apr 01 TA - Heart PG - 462--462 VI - 85 IP - 4 4099 - http://heart.bmj.com/content/85/4/462.short 4100 - http://heart.bmj.com/content/85/4/462.full SO - Heart2001 Apr 01; 85