1. Deutsches Rheuma‐Forschungszentrum (DRFZ)an Institute of the Leibniz Association Berlin Germany
2. Sanofi‐Aventis GermanyFrankfurt am Main Germany
3. Division of Nephrology and Internal Intensive Care MedicineCharité‐Universitätsmedizin Berlin Germany
4. Department of Rheumatology and Clinical ImmunologyCharité‐Universitätsmedizin Berlin Germany