1. Department of Ophthalmology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
2. Department of Ophthalmology, Memorial Institute for Ophthalmic Research (MIOR), Giza, Egypt
3. Department of Ophthalmology, Ophthalmology Specialist, Ports Teaching Hospital, Basra, Iraq
4. Department of Ophthalmology, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
5. Department of Ophthalmology, Faculty of Medicine, Al-Azhar University, Assiut, Egypt
6. Department of Ophthalmology, Faculty of Medicine, Menoufia University, Shibin el Kom, Egypt
7. Department of Ophthalmology, Research Institute of Ophthalmology, Giza, Egypt
8. Department of Ophthalmology, Faculty of Medicine, Ain Shams University, Cairo, Egypt