1. Excellence Centre of Occupational Health, Research Center for Health Sciences, School of Public Health, Hamedan University of Medical Sciences, Hamedan, Iran.
2. Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, Tehran, Iran.
3. Department of Biostatistics and Epidemiology, School of Public Health and Center of Health Research, Hamedan University of Medical Sciences, Hamedan, Iran.