1. London School of Medicine, Barts and the London School of Medicine and Dentistry, London, United Kingdom
2. Department of Pathology and Laboratory Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
3. Department of Cardiovascular Diseases, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia
4. Department of Cardiology, Angereds Narsjukhus, Angered, Sweden