1. Department of Nephrology and Hypertension; University Hospital of the Friedrich-Alexander-University Erlangen-Nürnberg; Erlangen Germany
2. Department of Nephrology and Hypertension; Hannover Medical School; Hannover Germany
3. Divisions of Nephrology and Intensive Care Medicine; Department of Internal Medicine; University Hospital Würzburg; and Comprehensive Heart Failure Center; Würzburg Germany