1 Center for Non-Communicable Disease Control, Ministry of Health & Medical Education, Tehran, Iran ; Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
2 Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
3 Cornea Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
4 Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA.