1. Center of Rehabilitation Research, University of Potsdam, Potsdam, Germany.
2. Klinik am See, Rüdersdorf, Germany.
3. Chair of Healthcare Management and Health Services Research, University of Bayreuth, Bayreuth, Germany.
4. Institute of Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany.
5. German Heart Institute Berlin, University of Berlin, Berlin, Germany.
6. Comprehensive Heart Failure Center, University Hospital Würzburg, Würzburg, Germany.
7. Department of Internal Medicine I, University Hospital Würzburg, Germany, Würzburg, Germany.
8. Institute for Healthcare Management and Health Science, University of Bayreuth, Bayreuth, Germany.