1. Centre of Rehabilitation Research, University of Potsdam, Germany
2. Cardiological Outpatient Clinic Am Park Sanssouci, Potsdam, Germany
3. MediClin Rehabilitation Centre Spreewald, Burg, Germany
4. Sana Heart-Centre Cottbus, Cottbus, Germany
5. Brandenburgklinik Berlin-Brandenburg, Bernau, Germany
6. Heart Centre Brandenburg, Bernau, Germany
7. Department of Medical Biometry and Epidemiology, University Medical Centre, Hamburg-Eppendorf, Germany
8. Klinik am See, Rehabilitation Centre for Internal Medicine, Rüdersdorf, Germany