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Extended report
Lower etanercept levels are associated with high disease activity in ankylosing spondylitis patients at 24 weeks of follow-up
  1. E L Kneepkens1,
  2. C L M Krieckaert1,
  3. D van der Kleij2,
  4. M T Nurmohamed1,3,
  5. I E van der Horst-Bruinsma1,3,
  6. T Rispens4,
  7. G J Wolbink1,4
  1. 1Department of Rheumatology, Jan van Breemen Research Institute|Reade, Amsterdam, The Netherlands
  2. 2Laboratory for Monoclonal Therapeutics, Sanquin Diagnostic Services, Amsterdam, The Netherlands
  3. 3Department of Rheumatology, VU University Medical Centre, Amsterdam, The Netherlands
  4. 4Department of Immunopathology, Sanquin Research, Amsterdam, The Netherlands
  1. Correspondence to Eva-Linda Kneepkens, Department of Rheumatology, Jan van Breemen Research Institute|Reade, Dr Jan van Breemenstraat 2, Amsterdam 1056 AB, The Netherlands; e.kneepkens{at}

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