1. Cardiology Department, Al-Azhar University , Nasr City, 11651 Cairo , Egypt
2. Cardiology Unit, Sohar Hospital , Muwelleh Street, 311 Sohar , Oman
3. Cardiology Department, Amsterdam University Medical Center , Meibergdreef 9, 1105 AZ Amsterdam , The Netherlands
4. Hospital das Clinicas, School of Medicine, Federal University of Minas Gerais , Belo Horizonte, Minas Gerais , Brazil
5. Department of Cardiology, King Fahad Armed Forces Hospital , Jeddah , Saudi Arabia
6. Department of Cardiology, Guys and St Thomas’ NHS Foundation Trust Hospital London , London , UK
7. Heart, Vascular & Thoracic Institute, Cleveland Clinic London , London , UK