RT Journal Article SR Electronic T1 Pronounced PR depression JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 638 OP 638 DO 10.1136/heart.88.6.638 VO 88 IS 6 A1 C Lee A1 W Czarnecki YR 2002 UL http://heart.bmj.com/content/88/6/638.abstract AB