1. Department of Pediatric Oncology, South Egypt Cancer Institute, Assiut University, Assiut, Egypt
2. Department of Pediatrics, Division of Pediatric Hematology and Oncology, Children’s Hospital, Lucerne, Switzerland
3. Department of Pediatrics and Adolescent Medicine, Mayo Clinic, Rochester, Minnesota, USA
4. Department of Pediatrics, Faculty of Medicine, Assiut University, Assiut, Egypt
5. Division of Pediatric Hematology and Oncology, Department of Pediatrics and Adolescent Medicine, University Hospital of Cologne, Cologne, Germany