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Haglund, E., Bremander, A. B., Petersson, I. F., Strömbeck, B., Bergman, S., Jacobsson, L. T. H., Turkiewicz, A., Geborek, P., & Englund, M. (2011). prevalence of spondyloarthritis and its subtypes in southern Sweden. Annals of the rheumatic diseases, 70(6), 943–948. http://access.bl.uk/ark:/81055/vdc_100137782626.0x00005d