Research article
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)?
Arthritis Research & Therapy 2013, 15:R14 doi:10.1186/ar4144
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