RT Journal Article SR Electronic T1 Atrial fibrillation: an emerging epidemic? JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 239 OP 240 DO 10.1136/hrt.2003.014720 VO 90 IS 3 A1 J S Steinberg YR 2004 UL http://heart.bmj.com/content/90/3/239.abstract AB