[1] Sheffield Teaching Hosp NHS Fdn Trust, Dept Rheumatol, Sheffield S10 2JF, S Yorkshire, England
[2] Univ Manchester, Ctr Biostat, Manchester, Lancs, England
[3] Charite Univ Med Berlin, Dept Rheumatol & Clin Immunol, Berlin, Germany
[4] Berlin Inst Hlth, Berlin, Germany
[5] Univ Lille, Lille Inflammat Res Int Ctr,Internal Med,LIRIC,U9, Ctr Reference Sclerodermie Syst,INSERM,CHU Lille, Serv Med Interne,Hop Claude Huriez,FHU IMMInENT, F-59000 Lille, France
[6] Spedali Civil Brescia, Rheumatol & Clin Immunol, Brescia, Italy
[7] Univ Campania, Div Rheumatol, Dept Precis Med, Naples, Italy
[8] Univ Hosp Zurich, Dept Rheumatol, Zurich, Switzerland
[9] Univ Florence, Div Rheumatol, Dept Expt & Clin Med, Florence, Italy