Ruben Daniel ARELLANO, et al. “Cartilage Oligomeric Matrix Protein Levels in Synovial Fluid in Patients With Primary Knee Osteoarthritis And Healthy Controls: A Preliminary Comparative Analysis With Serum Cartilage Oligomeric Matrix Protein”. Archives of Rheumatology, vol. 32, no. 3, Sept. 2017, pp. 189-96, doi:10.5606/ArchRheumatol.2017.6220.