1. Department of Medicine, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia
2. Faculty of Medicine, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia
3. Department of Community Medicine, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia
4. Ministry of Health, Department of Medicine, Riyadh, Kingdom of Saudi Arabia
5. Faculty of Medicine, King Saud University, Riyadh, Department of Medicine, Riyadh, Kingdom of Saudi Arabia
6. Faculty of Medicine, King Khalid University, Abha, Department of Medicine and Armed Forces Hospital, Riyadh, Kingdom of Saudi Arabia