1. Clinical Research Development Center, Imam Khomeini and Mohammad Kermanshahi and Farabi Hospitals, Kermanshah University of Medical Sciences, Kermanshah, Iran
2. Department of Ophthalmology, Imam Khomeini Eye Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
3. Department of Biostatistics, School of Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
4. Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran