[1] Rheumatol Praxiszentrum, Munich, Germany
[2] Charite, Dept Rheumatol & Clin Immunol, Berlin, Germany
[3] Rheumazentrum, Ratingen, Germany
[4] Rheumahaus Potsdam GbR, Potsdam, Germany
[5] MSD Sharp & Dohme GmbH, Med Affairs, Lindenpl 1, D-85540 Haar, Germany