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Reliability of self assessed joint counts in ankylosing spondylitis.
Spoorenberg A, van der Heijde D, Dougados M, de Vlam K, Mielants H, van de Tempel H, van der Linden S. Spoorenberg A, et al. Among authors: van de tempel h. Ann Rheum Dis. 2002 Sep;61(9):799-803. doi: 10.1136/ard.61.9.799. Ann Rheum Dis. 2002. PMID: 12176804 Free PMC article.