RT Journal Article SR Electronic T1 Peripheral muscle training in COPD: still much to learn JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 359 OP 360 DO 10.1136/thx.2004.035998 VO 60 IS 5 A1 M D L Morgan YR 2005 UL http://thorax.bmj.com/content/60/5/359.abstract AB