1. From the Division of Internal Medicine, King Abdulaziz Medical City, Riyadh, Saudi Arabia
2. From the Division of Rheumatology, Department of Medicine, King Abdulaziz Medical City, Riyadh, Saudi Arabia
3. From the Department of Radiology, King Abdulaziz Medical City, Riyadh, Saudi Arabia
4. From the Department of Pathology, King Abdulaziz Medical City, Riyadh, Saudi Arabia