1. Heart Center, Segeberger Kliniken GmbH Bad Segeberg Germany
2. Medical Clinic II University Heart Center Lübeck Lübeck Germany
3. Cardiology Department Heart Center Leipzig at the University of Leipzig Leipzig Germany
4. Department of Internal Medicine II, Division of Cardiology Medical University of Vienna Vienna Austria
5. Cardiology Department, German Heart Center Technical University of Munich Munich Germany
6. Cardiology Department, Faculty of Medicine Zagazig university Zagazig Egypt