1. Cardiology Department; Universitätsklinikum Essen; Essen Germany
2. St. Elisabeth Klinik; Saarlouis Germany
3. St. Adolf-Stift; Reinbek Germany
4. Cardiology Department; Barzilai Medical Centre; Ashkelon Israel
5. Cardiology Department; Universitätsklinikum Würzburg; Germany
6. Cardiology Department; Russels Hall Hospital; Dudley UK
7. Cardiology Department; Helios Klinikum Aue GmbH; Aue Germany
8. Innere Abteilung, Allgemeines Krankenhaus Altona; Hamburg Germany
9. Good Hope Hospital; Sutton Coldfield UK
10. Biotronik SE & Co. KG; Berlin Germany
11. Cardiology Department; St. Peter's Hospital/St. George's; Chertsey UK