[1] German Rheumatism Res Ctr DRFZ, Epidemiol Div, Charitepl 1, D-10117 Berlin, Germany
[2] Schlosspk Klin, Internal Med Rheumatol Clin Immunol & Osteol 2, Berlin, Germany
[3] Immanuel Hosp, Rheumatol & Clin Immunol, Berlin, Germany
[4] Rheumatism Practice Bayreuth, Bayreuth, Germany
[5] Charite, Med Clin Focus Rheumatol & Clin Immunol, Berlin, Germany