1. Department of Cardiology, Electrophysiology; Erasmus Medical Center; Rotterdam The Netherlands
2. Department of Cardiology; School of Medicine Department of Cardiology; Balçova Izmir Turkey
3. Department of Cardiology; Ege University School of Medicine; Izmir Turkey
4. Gottsegen György Hungarian Institute of Cardiology; Budapest Hungary
5. Clinic of Cardiology; University of Medicine and Pharmacy of Tîrgu Mureş; Tîrgu Mureş Romania
6. Department of Cardiology; Onze Lieve Vrouwe Gasthuis; Amsterdam The Netherlands