RT Journal Article SR Electronic T1 Cardiac resynchronisation therapy for heart failure with narrow or normal QRS JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1029 OP 1031 DO 10.1136/hrt.2010.218438 VO 97 IS 13 A1 Yip, Gabriel Wai-Kwok A1 Fung, Jeffrey Wing Hong YR 2011 UL http://heart.bmj.com/content/97/13/1029.abstract AB