1. Research Center for Environmental Determinants of Health (RCEDH), Kermanshah University of Medical Sciences, Kermanshah, Iran and Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
2. Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
3. Environmental and Occupational Health Research Center, Shahroud University of Medical Sciences, Shahroud, Iran
4. Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran