1. Department of Nephrology, Limassol General Hospital, State Health Services Organization, Limassol, Cyprus
2. Department of Basic and Clinical Sciences, University of Nicosia Medical School, Nicosia, Cyprus
3. Division of Nephrology, Department of Internal Medicine IV, Hospital of the Ludwig-Maximilians-University, Munich, Germany
4. Department of Pathology and Medical Biology, University of Groningen, University Medical Center, Groningen, The Netherlands
5. Center of Expertise for Lupus, Vasculitis and Complement-mediated Systemic Disease (LuVaCs), Department of Internal Medicine – Section Nephrology, Leiden University Medical Center, Leiden, The Netherlands
6. Department of Nephrology, Leiden University Medical Center, Leiden, The Netherlands
7. Nephrology Unit, Hospital Fernandez, Buenos Aires, Argentina
8. Division of Nephrology, The Ohio State University Wexner Medical Center, Columbus, Ohio
9. Department of Internal Medicine IV, Nephrology and Hypertension, Medical University Innsbruck, Innsbruck, Austria