1. Human Cytogenetics Department, National Research Centre, Cairo, Egypt
2. Pediatric Department, Children’s Cancer Hospital, Cairo, Egypt
3. Pediatric Oncology Department, National Cancer Institute, Cairo University, Cairo, Egypt
4. Clinical Genetics Department, National Research Centre, Cairo, Egypt
5. Ophthalmology Department, Children's Cancer Hospital, Egypt
6. Ophthalmology Department, Fayoum University, Faiyum, Egypt
7. Clinical Pathology Department, Children's Cancer Hospital, Egypt
8. Clinical Pathology Department, National Cancer Institute, Cairo University, Cairo, Egypt
9. Research Department, Children's Cancer Hospital, Egypt
10. Ophthalmology Department, Al-Azhar University, Cairo, Egypt
11. Ophthalmology Department, Ain Shams University, Cairo, Egypt
12. Ophthalmic Genetics Department, Research Institute of Ophthalmology, Cairo, Egypt