RT Journal Article SR Electronic T1 The role of exercise testing in chronic heart failure. JF British Heart Journal JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 559 OP 566 DO 10.1136/hrt.58.6.559 VO 58 IS 6 A1 Lipkin, D P YR 1987 UL http://heart.bmj.com/content/58/6/559.abstract AB