[1] Oslo Univ Hosp, Dept Rheumatol, Oslo, Norway
[2] Descartes Univ, Cochin Hosp, APHP, Dept Rheumatol Paris A, Cochin, Kerala, India
[3] Boehringer Ingelheim Int GmbH, Ingelheim, Germany
[4] Graf Biostat, Winterthur, Switzerland
[5] Spedali Civili Brescia, UO Reumatol & Immunol Clin, Brescia, Italy
[6] VA Nasonova Inst Rheumatol, Moscow, Russia
[7] Univ Pecs, Dept Rheumatol & Immunol, Pecs, Hungary
[8] Univ Florence, Rheumatol Sect, Dept Clin & Expt Med, Florence, Italy
[9] Univ Lille, Dept Internal Med & Clin Immunol, Hop Claude Huriez, Lille, France
[10] Peking Union Med Coll Hosp, Dept Rheumatol, West Campus, Beijing, Peoples R China
[11] Univ Hosp Zurich, Dept Rheumatol, Zurich, Switzerland
[12] Univ Med Ctr Schleswig Holstein, Dept Rheumatol & Clin Immunol, Lubeck, Germany
[13] Univ Athens, Joint Rheumatol Programme, Med Sch, Athens, Greece
[14] II Policlin UO Reumatol, Dipartimento Med Precis, Naples, Italy
[15] Med Univ Bialystok, Dept Rheumatol & Internal Med, Bialystok, Poland