[1] Univ Hosp Zurich, Dept Rheumatol, Ctr Expt Rheumatol, Zurich, Switzerland
[2] Univ Hosp Zurich, Dept Rheumatol, Zurich, Switzerland
[3] Graf Biostat, Winterthur, Switzerland
[4] Bayer HealthCare Pharmaceut Inc, Whippany, NJ USA
[5] Bayer PLC, Newbury, Berks, England
[6] Paris Descartes Univ, Cochin Hosp, Dept Rheumatol, Paris, France
[7] Univ Florence, Dept Med, Div Rheum, Florence, Italy
[8] Univ Western Ontario, Div Rheumatol, Dept Med, St Josephs Hlth Care, London, ON, Canada
[9] UCL, Royal Free Hosp, Dept Rheumatol, London, England
[10] Univ Michigan, Dept Internal Med, Div Rheumatol, Scleroderma Program, Ann Arbor, MI 48109 USA