1. Department of Internal Medicine, Al-Mouassat Hospital, Riyadh, Saudi Arabia
2. Critical Care Services, General Assembly of Damascus Hospital, Riyadh, Saudi Arabia
3. Al-Bassel Heart Institute, Riyadh, Saudi Arabia
4. Critical Care Services, Ibn Al-Nafees Hospital, Saudi Arabia
5. World Health Organization (Damascus Office), Riyadh, Saudi Arabia
6. Adult Critical Care Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia