1. Noor Ophthalmology Research Center; Noor Eye Hospital; Tehran Iran
2. Farabi Eye Hospital; Tehran University of Medical Sciences; Tehran Iran
3. Shahroud University of Medical Sciences; Shahroud Iran
4. Department of Ophthalmology; Jules Stein Eye Institute; David Geffen School of Medicine; University of California; Los Angeles California USA
5. Education Development Center; Tehran University of Medical Sciences; Tehran Iran
6. Department of Epidemiology and Biostatistics; School of Public Health; Tehran University of Medical Sciences; Tehran Iran