1. School of Medicine, Cardiff University, Cardiff, Wales, United Kingdom
2. Department of Adult Hematology, King Abdulaziz Medical City, Ministry of National Guard Health Affairs, Riyadh, Saudi Arabia
3. Department of Pathology, Imam Muhammad ibn Saud Islamic University, Riyadh, Saudi Arabia
4. Department of Rheumatology, King Abdulaziz Medical City, Ministry of National Guard Health Affairs, Riyadh, Saudi Arabia