[1] Charite Univ Med Berlin, Berlin, Germany
[2] Leiden Univ, Med Ctr, Leiden, Netherlands
[3] Univ Nova Lisboa, NOVA Med Sch, Rheumatol, Lisbon, Portugal
[4] Zuyderland Med Ctr, Heerlen, Netherlands
[5] Amsterdam Rheumatol & Clin Immunol Ctr, Amsterdam, Netherlands
[6] Charite Univ Meidzin Berlin, Berlin, Germany
[7] Klinikum Bielefeld Rosenhohe, Rheumatol, Berlin, Germany
[8] German Rheumatism Res Ctr, Berlin, Germany