1. Department of Nephrology and Endocrinology, Klinikum Ernst von Bergmann, Potsdam, Germany
2. Medical Faculty, Otto-von-Guericke University, Magdeburg, Germany
3. Diamedikum, Potsdam, Germany
4. Department of Nephrology and Hypertension, Hannover Medical School, Hannover, Germany
5. Department of Cardiology, Immanuel Diakonie Bernau, Heart Center Brandenburg, Brandenburg Medical School Theodor Fontane, MHB, Germany
6. Institute of Social Medicine and Health Systems Research, Otto-von-Guericke University Magdeburg, Magdeburg, Germany
7. University Clinic for Cardiology and Angiology, Otto-von-Guericke University, Magdeburg, Germany
8. Department of Nephrology, Central Clinic Bad Berka, Bad Berka, Germany