[1] Heinrich Heine Univ Dusseldorf, Klin Rheumatol, UKD, Dusseldorf, Germany
[2] Heinrich Heine Univ Dusseldorf, Hiller Forschungszentrum Rheumatol, UKD, Moorenstr 5, D-40225 Dusseldorf, Germany
[3] Johannes Gutenberg Univ Mainz, Univ Med, Rheumatol & Klin Immunol, Mainz, Germany
[4] Heinrich Heine Univ Dusseldorf, Klin Rheumatol, UKD, Moorenstr 5, D-40225 Dusseldorf, Germany