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Lee, D. M., Phillips, R., Hagan, E. M., Chibnik, L. B., Costenbader, K. H., & Schur, P. H. (2009). quantifying anti-cyclic citrullinated peptide titres: clinical utility and association with tobacco exposure in patients with rheumatoid arthritis. Annals of the rheumatic diseases, 68(2), 201–208. http://access.bl.uk/ark:/81055/vdc_100137791948.0x00005a