RT Journal Article SR Electronic T1 Atrial appendage occlusion for stroke prevention in patients with atrial fibrillation JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1943 OP 1944 DO 10.1136/heartjnl-2016-310198 VO 102 IS 24 A1 M J Swaans A1 L V A Boersma YR 2016 UL http://heart.bmj.com/content/102/24/1943.abstract AB