1. Heart Center, Hirslanden St Anna , Zentralstrasse 1, 6003 Lucerne , Switzerland
2. Cardiology Department, Ordensklinikum , Linz , Austria
3. Cardiology Department, Inselspital Bern , Bern , Switzerland
4. R and D Department, Johnson and Johnson , Zug , Switerland
5. Department of Cardiac Electrophysiology, Liverpool Heart and Chest Hospital , Liverpool , UK