1. University Hospital of Lausanne, Medical Policlinic, CHUV Lausanne and Yverdon-les-Bains
2. Department of Cardiology and Internal Medicine, University Hospital of Zurich, Zürich
3. Department of Cardiology, University Hospital and Medical Faculty of Berne, Inselspital Bern
4. University Hospital of Lausanne, Medical Policlinic, CHUV Lausanne, Switzerland