1. Eye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
2. Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
3. University of Arizona, Department of Ophthalmology & Vision Science, Tucson, Arizona, USA
4. Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
5. College of Health and Life Sciences, Aston University, Birmingham, UK
6. Department of Nursing and Midwifery, Zahedan University of Medical Sciences, Zahedan, Iran