1. Ophthalmic Epidemiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
2. Ophthalmic Research Center, Labbafinejad and Imam Hossein Medical Centers, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
3. Department of Ophthalmology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
4. Department of Epidemiology and Biostatistics, Tehran University of Medical Sciences, Tehran, Iran.