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Validation of the Italian Versions of the Bath Ankylosing Spondylitis Functional Index (BASFI) and the Dougados Functional Index (DFI) in Patients With Ankylosing Spondylitis. Reumatismo 2005, 57 (3), 161-173. https://doi.org/10.4081/reumatismo.2005.161.