[1] Univ Hosp, Dept Nephrol & Hypertens, Inselspital, Bern, Switzerland
[2] Univ Hosp Lausanne, Div Clin Immunol & Allergy, Lausanne, Switzerland
[3] Univ Hosp & Sch Med, Div Clin Immunol & Allergy, Dept Internal Med, Geneva, Switzerland
[4] Univ Hosp Basel, Div Internal Med, Dept Biomed, Basel, Switzerland
[5] Univ Hosp Basel, Clin Immunol Lab, Dept Biomed, Basel, Switzerland
[6] Kantonsspital St Gallen, Div Rheumatol & Immunol, Dept Internal Med, St Gallen, Switzerland