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Long-term outcome of patients with active ankylosing spondylitis with etanercept-sustained efficacy and safety after seven years

Xenofon Baraliakos*, Hildrun Haibel, Claudia Fritz, Joachim Listing, Frank Heldmann, Juergen Braun and Joachim Sieper

Arthritis Research & Therapy 2013, 15:R67  doi:10.1186/ar4244

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