[1] Univ Lubeck, Klin Rheumatol & Klin Immunol, Ratzeburger Allee 160, D-23652 Lubeck, Germany
[2] Stadt Krankenhaus Kiel, Kiel, Germany
[3] MVZ Med Lab Nord MLN GMBH, D-22149 Hamburg, Germany
[4] Justus Liebig Univ Giessen, Abt Innere Med & Rheumatol, Campus Kerckhoff, Bad Nauheim, Germany
[5] Univ Munster, Inst Muskuloskelettale Med, Albert Schweitzer Campus 1, Munster, Germany