[1] Hosp Special Surg, Inflammatory Arthrit Ctr, New York, NY 10021 USA
[2] Mt Sinai Hosp, Dept Rheumatol, Toronto, ON M5G 1X5, Canada
[3] Univ Cambridge, Cambridge, England
[4] Hosp Univ Princesa, IIS Princesa, Madrid, Spain
[5] Inst Rheumatol, Prague, Czech Republic
[6] Hosp Univ La Fe, Valencia, Spain
[7] Med Univ Graz, Graz, Austria
[8] McMaster Univ, St Josephs Hosp, Hamilton, ON, Canada
[9] Vrije Univ Amsterdam, Med Ctr, Amsterdam, Netherlands
[10] Immanuel Hosp, Berlin, Germany
[11] F Hoffmann La Roche, Basel, Switzerland
[12] CHU Hautepierre, F-67098 Strasbourg, France