1. Department of Ophthalmology, Ministry of National Guard - Health Affairs, Riyadh
2. King Abdullah International Medical Research Center, Riyadh
3. King Saud bin Abdulaziz University for Health Sciences, Riyadh
4. Department of Optometry, College of Applied Medical Sciences, Qassim University, Buraidah
5. Department of Ophthalmology, Armed Forces Hospital, Armed Forces Medical Services, Al-Kharj