1. Department of Cardiology, Heart and Diabetes Center North Rhine-Westphalia, Ruhr University Bochum, Bad Oeynhausen, Germany
2. Department of Cardiology and Angiology, Marienhospital Herne, Herne, Germany
3. Department of Physiotherapy, Heart and Diabetes Center North Rhine-Westphalia, Ruhr University Bochum, Bad Oeynhausen, Germany
4. Department of Cardiology and Angiology, New Bethlehem Hospital, Goettingen, Germany