1. Consultant Cardiologist, Armed Forces Hospital, Riyadh
2. Resident, Department of Medicine, King Faisal Specialist Hospital and Research Centre, P. O. Box 3354, Riyadh 11211, Saudi Arabia
3. Staff Cardiologist, Department of Medicine, King Faisal Specialist Hospital and Research Centre, P. O. Box 3354, Riyadh 11211, Saudi Arabia