[1] Ctr Innovat Diagnost & Therapie Rheumatol Immunol, Sandhofer Allee 6, D-60528 Frankfurt, Germany
[2] Schlosspk Klin, Berlin, Germany
[3] Med Univ Klin Freiburg, Freiburg, Germany
[4] Rheumazentrum Ruhrgebiet, Herne, Germany
[5] Zeisigwaldkliniken Bethanien, Chemnitz, Germany
[6] Max Planck Inst Physiol & Clin Res, Kerckhoff Klin, Bad Nauheim, Germany
[7] Klinikum Univ Munchen, Munich, Germany
[8] Univ Erlangen Nurnberg, D-91054 Erlangen, Germany
[9] Hannover Med Sch, Hannover, Germany
[10] Univ Klin Koln, Cologne, Germany
[11] St Josef Krankenhaus Essen Werden GmbH, Essen, Germany
[12] Univ Klinikum Carl Gustav Carus, Dresden, Germany
[13] Rheumazentrum Ratingen, Ratingen, Germany
[14] Charite, D-13353 Berlin, Germany