[1] Univ Hosp Zurich, Dept Rheumatol, Zurich, Switzerland
[2] Univ Zurich, Zurich, Switzerland
[3] Hosp Univ 12 Octubre, Rheumatol Dept, Madrid, Spain
[4] Leiden Univ, Med Ctr, Ctr Dept Rheumatol, Leiden, Netherlands
[5] Technion, Rappaport Fac Med, Rambam Hlth Care Campus, Rheumatol Inst, Haifa, Israel
[6] Univ Campania, Naples, Italy
[7] Marche Univ Hosp, Dept Internal Med, Clin Med, Ancona, Italy
[8] Univ Hosp Erlangen, Dept Internal Med 3, Erlangen, Germany
[9] Hop Cochin, Dept Internal Med, Paris, France
[10] Ctr Rheumatol Royal Free, London, England
[11] UCL, Sch Med, London, England
[12] Irccs Humanitas Res Hosp, Milan, Italy
[13] Univ Hosp Cagliari, Rheumatol Unit, Monserrato, CA, Italy
[14] Kantonsspital Aarau, Dept Rheumatol & Immunol, Aarau, Switzerland
[15] Ctr Hosp Lisboa, Hosp Curry Cabral, Unidade Doencas Autoimunes, Lisbon, Portugal
[16] Bordeaux Univ Hosp, Dept Rheumatol, Bordeaux, France
[17] Radboud Univ Nijmegen, Med Ctr, Dept Rheumatol, Nijmegen, Netherlands
[18] Univ Leeds, Leeds Inst Rheumat & Muskuloskeletal Med, Leeds, W Yorkshire, England
[19] Oslo Univ Hosp, Dept Rheumatol, Oslo, Norway