1. College of Medicine, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
2. King Abdullah International Medical Research Centre, Riyadh, Saudi Arabia
3. Division of Pulmonary, Ministry of National Guard-Health Affairs, Department of Medicine, Riyadh, Saudi Arabia
4. Internal Medicine Division, Ministry of National Guard-Health Affairs, Department of Medicine, Madinah, Saudi Arabia
5. Department of Imaging, Ministry of National Guard-Health Affairs, Riyadh, Saudi Arabia
6. Internal Medicine Division, Ministry of National Guard-Health Affairs, Department of Medicine, Riyadh, Saudi Arabia
7. Department of Pathology and laboratory, Ministry of National Guard-Health Affairs, Riyadh, Saudi Arabia