1. Department of Cardiology, Queen Elizabeth Hospital, University Hospitals Birmingham NHS Foundation Trust, Mindelsohn Way, Edgbaston, B15 2TH Birmingham, UK
2. Royal Hospital, National Heart Centre, Ministry of Health, Al-Ghubrah, Muscat, Oman
3. Cardiology Department, Faculty of Medicine, Tanta University, Tanta, Egypt
4. Department of Haematology, Queen Elizabeth Hospital, University Hospitals Birmingham NHS Foundation Trust, Mindelsohn Way, Edgbaston, B15 2TH Birmingham, UK
5. Institute of Cardiovascular Sciences, University of Birmingham, B15 2TT, UK