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APA Citation
Machado, P., Landewé, R., Braun, J., Hermann, K. A., Baraliakos, X., Baker, D., Hsu, B., & van der Heijde, D. (2011). a stratified model for health outcomes in ankylosing spondylitis. Annals of the rheumatic diseases, 70(10), 1758–1764. http://access.bl.uk/ark:/81055/vdc_100137785191.0x000055