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Shumnalieva, R., Velikova, T., Kachakova, D., Monov, S., Tumangelova-Yuzeir, K., Kyurkchiev, D., & Rashkov, R. (n.d.). 03.04 Serum and synovial concentration of calprotectin in rheumatoid arthritis patients. Annals of the rheumatic diseases, 76, A31. http://access.bl.uk/ark:/81055/vdc_100135540935.0x000064