1. Second Department of Cardiology, Laboratory of Cardiac Electrophysiology; Evangelismos General Hospital of Athens; Athens Greece
2. Division of Cardiology, Queen's University; Kingston General Hospital; Kingston Ontario Canada
3. Department of Cardiology, Tianjin Institute of Cardiology; Second Hospital of Tianjin Medical University; Tianjin P.R. China
4. Department of Cardiology; University Hospital of Ioannina; Ioannina Greece
5. Department of Medicine and Therapeutics; Chinese University of Hong Kong; Hong Kong SAR P.R. China
6. Li Ka Shing Institute of Health Sciences; Chinese University of Hong Kong; Hong Kong SAR P.R. China
7. Department of Cardiovascular Medicine; Osaka City University Graduate School of Medicine; Osaka Japan
8. Electrophysiology Section; St. Josefs-Hospital; Wiesbaden Germany