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To compare aspects of validity of EuroQol-5 Dimensions (EQ-5D) and Short-Form-6 Dimensions (SF-6D), two indirect utility instruments, and the well-being rating scale (RS) in ankylosing spondylitis (AS).

How do the EQ-5D, SF-6D and the well-being rating scale compare in patients with ankylosing spondylitis?