PT - JOURNAL ARTICLE AU - Burrell, C J AU - Blake, D R TI - The authors reply AID - 10.1136/hrt.62.6.491 DP - 1989 Dec 01 TA - British Heart Journal PG - 491--492 VI - 62 IP - 6 4099 - http://heart.bmj.com/content/62/6/491.short 4100 - http://heart.bmj.com/content/62/6/491.full SO - Heart1989 Dec 01; 62