RT Journal Article SR Electronic T1 Prevalence and clinical implications of atrial fibrillation episodes detected by pacemaker in patients with sick sinus syndrome JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 362 OP 364 DO 10.1136/hrt.2003.027219 VO 91 IS 3 A1 H F Tse A1 C P Lau YR 2005 UL http://heart.bmj.com/content/91/3/362.abstract AB