Decreased serum biochemical markers of muscle origin in patients with ankylosing spondylitis
Erik J Giltay, Dirkjan van Schaardenburg, Louis J G Gooren, Piet J Kostense, Ben A C Dijkmans
Annals of the Rheumatic Diseases Sep 1999, 58 (9) 541-545; DOI: 10.1136/ard.58.9.541