1. Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran
2. Rassoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
3. Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran
4. Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran