[1] Univ Hosp Zurich, Dept Rheumatol, Zurich, Switzerland
[2] Shanghai Jiao Tong Univ, Sch Med, Ren Ji Hosp, Dept Rheumatol, South Campus, Shanghai, Peoples R China
[3] Oslo Univ Hosp, Dept Rheumatol, Rikshosp, Oslo, Norway
[4] Charite Univ Med Berlin, Dept Rheumatol & Clin Immunol, Berlin, Germany
[5] Paris Descartes Univ, Cochin Hosp, Rheumatol Dept A, Paris, France