Diurnal variation in serum levels of cartilage oligomeric matrix protein in patients with knee osteoarthritis or rheumatoid arthritis.
Andersson ML, Petersson IF, Karlsson KE, Jonsson EN, Månsson B, Heinegård D, Saxne T.
Ann Rheum Dis. 2006 Nov;65(11):1490-4. Epub 2006 May 17.