1. Department of Ophthalmology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
2. Department of Ophthalmology, Faculty of Medicine, Minia University, Minia, Egypt
3. Department of Ophthalmology, Faculty of Medicine, Helwan University, Cairo, Egypt
4. Department of Ophthalmology, Sohag Teaching Hospital, Sohag, Egypt
5. Department of Ophthalmology, Research Institute of Ophthalmology, Cairo, Egypt
6. Department of Ophthalmology, Faculty of Medicine, Assiut University, Assiut, Egypt
7. Department of Ophthalmology, Faculty of Medicine, Menoufia University, Menoufia, Egypt
8. Department of Ophthalmology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
9. Department of Ophthalmology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt
10. Department of Ophthalmology, Faculty of Medicine, Fayoum University, Fayoum, Egypt
11. Department of Ophthalmology, Faculty of Medicine, Sohag University, Sohag, Egypt
12. Department of Ophthalmology, Faculty of Medicine, Tanta University, Tanta, Egypt
13. Department of Ophthalmology, Faculty of Medicine, Al Azhar University, Assiut, Egypt
14. Department of Ophthalmology, Faculty of Medicine, Ain Shams University, Cairo, Egypt
15. Department of Ophthalmology, Faculty of Medicine, Cairo University, Cairo, Egypt
16. Department of Ophthalmology, Memorial Institute for Ophthalmic Research, Cairo, Egypt