Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran. Department of Environmental Health, School of Public Health, Kerman University of Medical Sciences, Kerman, Iran. Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran. m_faraji28@yahoo.com. Department of Environmental Health, School of Public Health, Kerman University of Medical Sciences, Kerman, Iran. m_faraji28@yahoo.com.