1. Department of Hematology, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
2. Hematology Research Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
3. Blood Transfusion Services Unit, King Abdulaziz University Hospital, Jeddah, Saudi Arabia
4. Department of Medical Education, College of Medicine, University of Illinois at Chicago, Chicago, IL, USA
5. Harvard Medical School, Boston, MA, USA