RT Journal Article SR Electronic T1 Serum myoglobin and creatine kinase concentrations in patients with polymyositis or dermatomyositis. JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 173 OP 174 DO 10.1136/ard.46.2.173 VO 46 IS 2 A1 Borleffs, J C A1 Derksen, R H A1 Bär, D P YR 1987 UL http://ard.bmj.com/content/46/2/173.abstract AB