1. Department of Medicine, College of Medicine, King Khalid University, P. O. Box 25216, Abha, Saudi Arabia
2. Department of Family Medicine, Armed Forces Hospital Southern Region, Khamis Mushayt, Saudi Arabia
3. Department of Critical Care, Aseer Central Hospital, Abha, Saudi Arabia
4. Department of medicine, King Faisal Medical City Southern Region, Abha, Saudi Arabia
5. Department of Medicine, Asser Central Hospital, Abha, Saudi Arabia
6. Department of Medicine, Samtah General Hospital, Jizan, Saudi Arabia
7. Department of Critical Care, Dr. Suliman AlHabib Medical Group, Riyadh, Saudi Arabia
8. Department of General Surgery, Armed Forces Hospital Southern Region, Khamis Mushait, Saudi Arabia
9. Department of Cardiology, Primacare Clinics, Avivo Group, Bur Dubai, Dubai, UAE