1. University Clinic of Internal Medicine III, Cardiology and Angiology, Medical University of Innsbruck, Austria
2. Department of Internal Medicine 2, Cardiology, Ordensklinikum Linz Barmherzige Schwestern, Linz, Austria
3. Department of Internal Medicine 2, Cardiology, Intensive Care Medicine, Klinikum Wels-Grieskirchen, Wels, Austria