1. Division of Cardiology, Department of Internal Medicine II, Medical University of Vienna , Waehringer Guertel 18-20, 1090 Vienna , Austria
2. Ludwig Boltzmann Institute for Cardiovascular Research , Waehringer Guertel 18-20, 1090 Vienna , Austria
3. 3rd Medical Department for Cardiology and Emergency Medicine, Wilhelminenhospital , Montleartstrasse 37, 1160 Vienna , Austria
4. Medical Faculty, Sigmund Freud University , Freudplatz 1, 1020 Vienna , Austria
5. Core Facilities, Medical University of Vienna , Waehringer Guertel 18-20, 1090 Vienna , Austria