1. Ophthalmology Department (Glaucoma Section), Immam Abdulrahman Bin Faisal University, King Fahd University Hospital, Al Khobar, Kingdom of Saudi Arabia
2. Dhahran Eye Specialist Hospital (DESH), Ministry of Health, Hanoi, Kingdom of Saudi Arabia
3. Prince Mutaib Bin Abdulaziz Hospital, Aljouf, Ministry of Health, Hanoi, Kingdom of Saudi Arabia