RT Journal Article SR Electronic T1 Heartbeat: Focus on atrial fibrillation JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 823 OP 825 DO 10.1136/heartjnl-2015-308020 VO 101 IS 11 A1 Catherine M Otto YR 2015 UL http://heart.bmj.com/content/101/11/823.abstract AB