1. Noor Ophthalmology Research Center; Noor Eye Hospital; Tehran Iran
2. Department of Epidemiology; Faculty of Public Health; Shahid Beheshti University of Medical Sciences; Tehran Iran
3. Department of Optometry; School of Paramedical Sciences; Mashhad University of Medical Sciences; Mashhad Iran
4. Dezful University of Medical Sciences; Dezful Iran
5. Department of Ophthalmology; Mashhad University of Medical Sciences; Mashhad Iran