RT Journal Article SR Electronic T1 Echocardiographic methods to select candidates for cardiac resynchronisation therapy JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 424 OP 429 DO 10.1136/hrt.2005.064014 VO 92 IS 3 A1 Frank A Flachskampf A1 Jens-Uwe Voigt YR 2006 UL http://heart.bmj.com/content/92/3/424.abstract AB