1. Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
2. Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
3. Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran
4. Tehran University of Medical Sciences1
5. Department of Optometry, Tehran University of Medical Sciences, Tehran, Iran