1. Cardiology, Internal Medicine Department, Klinikum Lichtenfels, Lichtenfels, Germany
2. Cardiology, Internal Medicine Department, Klinikum Hochrhein, Waldshut-Tiengen, Germany and Cardiology, Cardiovascular Department, University Hospital of Bern, Bern, Switzerland
3. Cardiology, Cardiovascular Department, University Hospital of Bern, Bern, Switzerland