1. Dialysis and Lipid Center North Rhine; Essen Germany
2. Center for Nephrology; Hypertension, and Metabolic Diseases; Hannover Germany
3. 3 Medical Clinic; University Hospital at the Technische Universität; Dresden Germany
4. Medical Health and Care Center Kempten-Allgäu; Kempten Germany
5. Center for Nephrology; Göttingen Germany
6. Clinic for Nephrology and Dialysis; Tangermünde Germany
7. Interdisciplinary Apheresis Center at Passau General Hospital; Passau Germany
8. Clinic for Nephrology; General Hospital; Coburg Germany
9. Center for Dialysis and Apheresis; Witten Germany
10. Center for Nephrology and Dialysis; Saarlouis Germany
11. Apheresis Research Institute; Cologne Germany
12. First Department of Internal Medicine; University of Mainz; Mainz Germany