1. Department of Pediatrics, Division of Infectious Diseases, King Abdullah Specialist Children’s Hospital, Riyadh, Saudi Arabia
2. Department of Pediatrics, Division of Infectious Diseases, Prince Sultan Military Medical City, Riyadh, Saudi Arabia
3. Department of Central Military Laboratory and Blood Bank, Division of Hematology, Prince Sultan Military Medical City, Riyadh, Saudi Arabia
4. Department of Pediatrics, Division of Hematology, Prince Sultan Military Medical City, Riyadh, Saudi Arabia