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Spoorenberg A, de Vlam K, van der Heijde D, de Klerk E, Dougados M, Mielants H, van der Tempel H, Boers M, van der Linden S. Radiological scoring methods in ankylosing spondylitis: reliability and sensitivity to change over one year. J Rheumatol. 1999 Apr;26(4):997–1002. PMID: 10229436. |