Age at disease onset and diagnosis delay in HLA-B27 negative vs. positive patients with ankylosing spondylitis

Springer Science and Business Media LLC - 2003
Ernst Feldtkeller1, Muhammad Asim Khan2, Désirée van der Heijde3, Sjef van der Linden3, Jürgen Braun4
1Ankylosing Spondylitis International Federation, Michaeliburgstraße 15, 81671 Munich, Germany,
2Case Western Reserve University, MetroHealth Medical Center, 2500 MetroHealth Drive, Cleveland, OH 44109-1998, USA,
3Department of Medicine, University Hospital Maastricht, Postbus 5800, 6202 AZ Maastricht, The Netherlands,
4Rheumazentrum Ruhrgebiet, St.-Josefs-Krankenhaus, Landgrafenstraße 15, 44652 Herne, Germany,

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