1. Department of Nephrology, University Hospital of the RWTH Aachen, Aachen, Germany
2. Department of Cardiology, University Hospital of the RWTH Aachen, Aachen, Germany
3. Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht, The Netherlands
4. Medical Department, Medice Pharma, Iserlohn, Germany
5. Division of Nephrology and Transplantation, Department of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands