title: Correspondence.
authors.affiliation: *Department of Epidemiology, Safety Promotion and Injury Prevention Research Center, Shahid Beheshti University of Medical Sciences, Tehran University of Medical Sciences, Tehran, Islamic Republic of Iran †Department of Clinical Epidemiology, School of Health, Shahid Beheshti University of Medical Sciences, Tehran, Islamic Republic of Iran ‡Department of Retina and Ocular Oncology Sciences, Tehran, Islamic Republic of Iran.
authors.forename: Siamak
authors.initials: S
authors.lastname: Sabour
authors.forename: Fariba
authors.initials: F
authors.lastname: Ghassemi