1. Cardiology Department, Faculty of Medicine, Ain Shams University Hospital, Ain Shams University , Abbasia Street, Abbasia District, Cairo 11517 , Egypt
2. Division of Cardiology, Rajavithi Hospital, College of Medicine, Rangsit University , Bangkok , Thailand
3. Department of Cardiology, Division of Electrophysiology, Cho Ray Heart Center , Ho Chi Minh City , Vietnam