1 Dept. of Epidemiology, School of Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
2 Dept. of Midwifery, School of Nursing, Kermanshah University of Medical Sciences, Kermanshah, Iran
3 Dept. of Biostatistics, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
4 Dept. of ENT, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran
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