1. Pediatric Hematology Unit; King Abdulaziz Medical City National Guard Health Affairs-Western Region; Jeddah Saudi Arabia
2. College of Medicine; King Saud bin Abdulaziz University for Health Sciences; Jeddah Saudi Arabia
3. Hematology Department; King Abdulaziz Medical City National Guard Health Affairs-Western Region; Jeddah Saudi Arabia
4. Pathology Department; King Abdulaziz Medical City National Guard Health Affairs-Western Region; Jeddah Saudi Arabia