RT Journal Article SR Electronic T1 Clinical relevance of arrhythmias during sleep: guidance for clinicians JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 347 OP 352 DO 10.1136/hrt.2003.019323 VO 90 IS 3 A1 L J Gula A1 A D Krahn A1 A C Skanes A1 R Yee A1 G J Klein YR 2004 UL http://heart.bmj.com/content/90/3/347.abstract AB