[1] Univ Alberta, Dept Med, Edmonton, AB, Canada
[2] Leiden Univ, Dept Rheumatol, Leiden, Netherlands
[3] Paris Descartes Univ, Dept Rheumatol, Paris, France
[4] Charite, Med Dept Rheumatol 1, D-13353 Berlin, Germany
[5] Rheumazentrum Ruhrgebiet, Dept Med, Herne, Germany
[6] Consultorios Reumatol Pampa, Dept Rheumatol, Buenos Aires, DF, Argentina
[7] Univ Paris 11, Hop Bicetre, Dept Rheumatol, Paris, France
[8] Chung Shan Med Univ Hosp, Dept Med, Taichung, Taiwan
[9] Pfizer Inc, Dept Clin Res, Collegeville, PA USA
[10] Pfizer France, Paris, France