1. Department of Nephrology and Medical Intensive Care; Charité - Universitätsmedizin Berlin; Berlin Germany
2. Department of Nephrology and Intensive Care Medicine; Humboldt-University; Berlin Germany
3. KfH Nierenzentrum Berlin-Charlottenburg; Berlin Germany
4. Department of Nephrology and Transplantation Medicine; Westpfalz-Klinikum; Kaiserslautern Germany
5. Department of Internal Medicine D/Transplant Nephrology; University Hospital Münster; Münster Germany
6. V Medizinische Klinik; Universitätsklinikum Mannheim; Mannheim Germany
7. Abteilung für Nephrologie; Universitätsklinikum Regensburg; Regensburg Germany