1. Pediatric Oncology Unit, Faculty of Medicine, Zagazig University, Zagazig, Egypt
2. Pediatric Department, Benha Pediatric Special Hospital, Benha, Egypt
3. Pediatric oncology department, National Cancer Institute, Cairo, Egypt
4. Psychiatry Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt
5. Pediatric Department, Faculty of Medicine, Cairo University, Cairo, Egypt