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Response to: H Zeidler's comments on the INFAST study
  1. Joachim Sieper
  1. Correspondence to Professor Joachim Sieper, Medical Department I, Rheumatology, Charité Campus Benjamin Franklin, Hindenburgdamm 30, Berlin 12200, Germany; joachim.sieper{at}charite.de

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In his comments about our Infliximab as First Line Therapy in Patients with Early Axial Spondyloarthritis (INFAST) trial,1 H Zeidler addresses the question whether a separation in patients with predominant axial spondyloarthritis (axSpA) and peripheral SpA manifestations makes sense and whether it reflects reality. Peripheral arthritis is one of the clinical parameters used in the classification criteria for axSpA.2 However, it is not used here as an activity parameter. Thus, is has been explicitly stated for these criteria that peripheral arthritis might be current or in the past. In most of the studies cited by H Zeidler peripheral arthritis1 ,3 was counted as current or in the past and current or past is not always reported in detail. However, this information is available in some of the studies. In the German Spondyloarthritis Inception Cohort (GESPIC) …

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