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ArthritisHelp Primer. - hort description of rheumatic diseases aimed at people with no prior knowledge of medical subjects. [http://rheuma.bham.ac.uk/primer.html]
The Virtual Hospital - University of Iowa Family Practice Handbook: Chapter 6: Ankylosing Spondylitis. [http://www.vh.org/Providers/ClinRef/FPHandbook/Chapter06/05-6.html]