1. Center of Nephrology Göttingen, Göttingen, Germany.
2. Clinic for Nephrology, Hannover Medical School, Hannover, Germany.
3. E-Health, University Hospital Zürich, Zürich, Switzerland.
4. Medical Clinic 1, HELIOS Albert-Schweitzer-Clinic Northeim, Northeim, Germany.
5. Division of Internal Medicine, University Hospital Zürich, Zürich, Switzerland.