Scoring radiographic progression in ankylosing spondylitis: should we use the modified Stoke Ankylosing Spondylitis Spine Score (mSASSS) or the Radiographic Ankylosing Spondylitis Spinal Score (RASSS)?
Sofia Ramiro*, Astrid van Tubergen, Carmen Stolwijk, Robert Landewé, Filip van de Bosch, Maxime Dougados and Désirée van der Heijde