1. Noor Research Center for Ophthalmic Epidemiology; Noor Eye Hospital; Tehran Iran
2. Department of Optometry; School of Paramedical Sciences; Mashhad University of Medical Sciences; Mashhad Iran
3. Refractive Errors Research Center; Mashhad University of Medical Sciences; Mashhad Iran
4. Eye Research Center; Rassoul Akram Hospital; Iran University of Medical Sciences; Tehran Iran
5. Khatam-al-Anbia Hospital; Mashhad University of Medical Sciences; Mashhad Iran
6. Department of Medical Surgical Nursing; School of Nursing and Midwifery; Shahid Beheshti University of Medical Sciences; Tehran Iran