1. Department of Internal Medicine, Division of General Internal Medicine and Nephrology, Robert-Bosch Hospital Stuttgart , Germany
2. Department of Internal Medicine, Division of Nephrology, Hypertension and Autoimmune Disorders, Alb-Fils Kliniken , Göppingen , Germany
3. Department of Nephropathology, Friedrich-Alexander-Universität Erlangen-Nürnberg , Erlangen , Germany