[1] Leiden Univ, Med Ctr, Dept Pathol, Leiden, Netherlands
[2] Univ Crete, Sch Med, Rheumatol Clin Immunol & Allergy, Iraklion, Greece
[3] FORTH, IMBB, Infect & Immun Div, Iraklion, Greece
[4] Acad Athens, Biomed Res Fdn, Athens, Greece
[5] Univ Birmingham, Coll Med & Dent Sci, Sch Immun & Infect, Rheumatol Res Grp,Med Sch, Birmingham, W Midlands, England
[6] Imperial Coll London, Dept Med, Sect Renal Med & Vasc Inflammat, London, England
[7] Charles Univ Prague, Sch Med 1, Dept Nephrol, Prague, Czech Republic
[8] Addenbrookes Hosp, Lupus & Vasculitis Unit, Cambridge, England