1. Pediatric Oncology Department, Children’s Cancer Hospital Egypt, Cairo, Egypt
2. Egyptian National Cancer Institute, Cairo University, Cairo, Egypt
3. Pathology Department, Children’s Cancer Hospital Egypt, Cairo, Egypt
4. Research Department, Children’s Cancer Hospital Egypt, Cairo, Egypt
5. Ophthalmology Unit, Children’s Cancer Hospital Egypt, Cairo, Egypt
6. Research Institute of Ophthalmology, Giza, Egypt
7. Radiation Oncology Department, Children’s Cancer Hospital Egypt, Cairo, Egypt
8. Department of Oncology, St. Jude Children’s Research Hospital, Memphis, Tennessee, USA
9. Ophthalmology Department, Charité, Universitätsmedizin Berlin, Berlin, Germany