1. Cardiology, University Hospital Basel, University of Basel, Switzerland
2. Cardiology, Cantonal Hospital Fribourg, Switzerland
3. HeartClinic, Hirslanden Hospital Zurich, Switzerland
4. Cardiology, Cantonal Hospital Chur, Switzerland
5. Cardiology, University Hospital Lausanne, University of Lausanne, Switzerland
6. HerzGefässZentrum, Hirslanden Klinik im Park, Zurich, Switzerland
7. Cardiology, University Hospital Bern, University of Bern, Switzerland
8. Cardiology, Cantonal Hospital St Gallen, Switzerland