1. Internal Medicine and Rheumatology, King Fahad University Hospital, Imam Abdulrahman Bin Faisal University, Dammam, SAUDI ARABIA
2. Neurology, King Fahad University Hospital, Imam Abdulrahman Bin Faisal University, Dammam, SAUDI ARABIA
3. Internal Medicine and Hematology, King Fahad University Hospital, Imam Abdulrahman Bin Faisal University, Dammam, SAUDI ARABIA
4. Internal Medicine, Qatif Central Hospital, Al Qatif, SAUDI ARABIA
5. General Medicine, Saud Al Babtain Cardiac Hospital, Dammam, SAUDI ARABIA
6. King Saud bin Abdulaziz University for Health Sciences, Riyadh, SAUDI ARABIA