[1] Norfolk & Norwich Univ Hosp, Dept Rheumatol, Norwich NR4 7UY, Norfolk, England
[2] Univ East Anglia, Norwich Med Sch, Norwich, Norfolk, England
[3] Ipswich Hosp NHS Trust, Dept Rheumatol, Ipswich, Suffolk, England
[4] Leiden Univ, Med Ctr, Dept Pathol, Leiden, Netherlands
[5] Univ Barcelona, Hosp Clin, IDIBAPS, Vasculitis Res Unit,Dept Autoimmune Dis, Barcelona, Spain
[6] Bichat Claude Bernard Univ Hosp, AP HP, Dept Pulmonol, Paris, France
[7] Immunol Zentrum Zurich, Zurich, Switzerland
[8] Kreiskliniken Esslingen, Klin Innere Med Rheumatol & Immunol, Vaskulits Zentrum Sud, Kirchheim unter Teck, Germany
[9] Rheumazentrum Schleswig Holstein Mitte, Neumunster, Germany
[10] Univ Kiel, Dept Otorhinolaryngol Head & Neck Surg, Kiel, Germany
[11] Tallaght Hosp, Trinity Hlth Kidney Ctr, Dublin, Ireland
[12] Univ Oxford, Botnar Res Ctr, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Oxford, England
[13] Univ Paris 07, Hop St Louis, Dept Internal Med, Paris, France
[14] Univ Penn, Div Rheumatol, Philadelphia, PA 19104 USA
[15] Univ Penn, Dept Biostat & Epidemiol, Philadelphia, PA 19104 USA
[16] Vasculitis UK, West Bank House, Winster, Matlock, England
[17] Linkoping Univ, Dept Med & Hlth Sci, Linkoping, Sweden
[18] Linkoping Univ, Dept Nephrol, Linkoping, Sweden
[19] Charles Univ Prague, Sch Med 1, Dept Nephrol, Prague, Czech Republic
[20] Lund Univ, Skane Univ Hosp, Dept Nephrol, Malmo, Sweden
[21] Lund Univ, Skane Univ Hosp, Dept Nephrol, Malmo, Sweden
[22] Univ Hosp Parma, Nephrol Unit, Parma, Italy
[23] Ankara Univ, Sch Med, Dept Ophthalmol, Ankara, Turkey
[24] Addenbrookes Hosp, Lupus & Vasculitis Unit, Cambridge, England