1. Wilhelminenhospital, Vienna, Austria
2. Hospital Barmherzige Schwestern, Linz, Austria
3. Hospital Kreuzschwestern, Wels, Austria
4. LKH Graz West, Graz, Austria
5. AKH Linz, Linz, Austria
6. University Hospital Innsbruck, Innsbruck, Austria
7. Hanusch Hospital, Vienna, Austria
8. Hospital SMZ Ost, Vienna, Austria
9. Hospital Kaiser-Franz-Josef, Vienna, Austria
10. Elisabethinen Hospital, Linz, Austria
11. University Hospital of Internal Medicine II (Cardiology) of the Paracelsus Private University, Salzburg, Austria