RT Journal Article SR Electronic T1 Exercise and heart failure: assessment and treatment JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 699 OP 703 DO 10.1136/hrt.2005.073643 VO 92 IS 5 A1 Andrew L Clark YR 2006 UL http://heart.bmj.com/content/92/5/699.abstract AB