1. Pediatric Oncology Department; National Cancer Institute (NCI); Cairo University; Cairo Egypt
2. Pediatric Stem Cell Transplantation Unit; Dana Farber/Children's Hospital Cancer Care Center; Boston MA USA
3. Pediatric Hematology/Oncology and Stem Cell Transplant Unit; Prince Sultan Military Medical City (PSMMC); Riyadh Saudi Arabia
4. Pediatric Oncology and Bone Marrow Transplant Department; Children's Cancer Hospital Egypt (CCHE-57357); Cairo Egypt