[1] Hop Cochin, APHP, Rheumatol Dept B, Serv Rhumatol B, F-75014 Paris, France
[2] Paris Descartes Univ, Paris, France
[3] Med Univ Vienna, Div Rheumatol, Dept Med 3, Vienna, Austria
[4] Hietzing Hosp, Dept Med 2, Vienna, Austria
[5] Univ Paris 06, Paris, France
[6] Hop La Pitie Salpetriere, Dept Rheumatol, Paris, France
[7] Univ Leeds, Sect Musculoskeletal Dis, Leeds Inst Mol Med, Leeds, W Yorkshire, England
[8] Leeds Teaching Hosp Trust, NIHR Leeds Musculoskeletal Biomed Res Unit, Leeds, W Yorkshire, England
[9] Leiden Univ, Med Ctr, Dept Rheumatol, Leiden, Netherlands
[10] Univ Coll Dublin, Conway Inst, Dublin, Ireland
[11] St Vincents Univ Hosp, Dept Rheumatol, Dublin 4, Ireland
[12] Natl Inst Rheumatism & Physiotherapy, Rheumatol Dept 3, Budapest, Hungary
[13] Univ Crete, Fac Med, Iraklion, Greece
[14] Ruhr Univ Bochum, Rheumazentrum Ruhrgebiet, Bochum, Germany
[15] Charite, Dept Rheumatol & Clin Immunol, D-13353 Berlin, Germany
[16] Hosp Clin Barcelona, Arthrit Unit, Dept Rheumatol, Barcelona, Spain
[17] IDIBAPS, Barcelona, Spain
[18] PARE, Zurich, Switzerland
[19] Diakonhjemmet Hosp, Dept Rheumatol, Oslo, Norway
[20] Univ Oslo, Fac Med, Oslo, Norway
[21] Univ Hosp, Dept Rheumatol, Louvain, Belgium
[22] Univ Calif San Diego, Div Rheumatol, San Diego, CA 92103 USA
[23] Univ Hosp Maastricht, Dept Internal Med Rheumatol, Maastricht, Netherlands
[24] Univ Hosp Munster, Dept Dermatol, Munster, Germany
[25] PE Pso POF Pan European Psoriasis Patients Org Fo, ADI PSO Assoc Difesa Psorias, Rome, Italy
[26] Royal Natl Hosp Rheumat Dis, Dept Rheumatol, Bath BA1 1RL, Avon, England
[27] Univ Glasgow, Inst Infect Immun & Inflammat, Glasgow, Lanark, Scotland
[28] Univ Rochester, Med Ctr, Allergy Immunol & Rheumatol Div, Rochester, NY 14642 USA
[29] Charite, Berlin, Germany
[30] Univ Amsterdam, Acad Med Ctr, Div Clin Immunol & Rheumatol, NL-1105 AZ Amsterdam, Netherlands
[31] Univ Roma La Sapienza, Dept Internal Med, Rheumatol Unit, Rome, Italy
[32] Inst Rheumatol, Prague, Czech Republic
[33] Oregon Hlth & Sci Univ, Dept Infect Dis Publ Hlth & Prevent Med, Portland, OR 97201 USA
[34] German Rheumatism Res Ctr, Berlin, Germany