Document Type : Research Paper
Authors
1 Department of Occupational Medicine, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
2 PhD in Statistics and Epidemiology, Department of Biostatistics, School of Public Health, Mashhad University of Medical Sciences, Mashhad, Iran
3 Department of occupational Medicine, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
Abstract
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