Document Type : Research Paper
Authors
1 Hamadan university of medical science
2 Center of Excellence for Occupational Health, Occupational Health and Safety Research Center, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
3 Department of Biostatistics, School of Public Health and Research Center for Health Sciences, Hamadan Uni versity of Medical Sciences, Ðamadan, Iran
Abstract
Keywords