1. Center of Excellence for Occupational Health, Research Center for Health Sciences, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
2. Department of Analytical Chemistry, Bu-Ali Sina University, Hamadan, Iran
3. Department of Environmental Health Engineering, Faculty of Health, Arak University of Medical Sciences, Arak, Iran
4. Department of Biostatistics, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran