1. Department of Cardiology, Geneva University Hospital, Rue Gabrielle Perret Gentil 4, 1205 Geneva, Switzerland
2. Department of Cardiology, University and Hospital Fribourg, Fribourg, Switzerland
3. Service of Cardiology, Cardiovascular Department, Lausanne University Hospital, Lausanne, Switzerland
4. Department of Cardiology, Sion Hospital
5. Klinik Hirslanden, Zurich, Switzerland