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    Braun, J., Brandt, J., Listing, J., Zink, A., Alten, R., Burmester, G., Gromnica-Ihle, E., Kellner, H., Schneider, M., Sörensen, H., Zeidler, H., & Sieper, J. (2005). two year maintenance of efficacy and safety of infliximab in the treatment of ankylosing spondylitis. Annals of the rheumatic diseases, 64(2), 229–234. http://access.bl.uk/ark:/81055/vdc_100135133253.0x000060