RT Journal Article SR Electronic T1 Skeletal muscle weakness, fatigue and sarcoidosis JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1 OP 2 DO 10.1136/thx.2004.027342 VO 60 IS 1 A1 U Costabel YR 2005 UL http://thorax.bmj.com/content/60/1/1.abstract AB