RT Journal Article SR Electronic T1 New guidelines for cardiac resynchronisation therapy: simplicity or complexity for the doctor? JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1017 OP 1019 DO 10.1136/hrt.2007.122267 VO 93 IS 9 A1 C Leclercq YR 2007 UL http://heart.bmj.com/content/93/9/1017.abstract AB See article on page 1134