1. Department of Occupational Health, Health Faculty, Arak University of Medical Sciences, Arak, Iran
2. Division of Environmental Epidemiology, Institute for Risk Assessment Sciences (IRAS), Utrecht University, TD Utrecht, The Netherlands
3. Institute for Prevention and Occupational Medicine of the German Social Accident Insurance (IPA), Institute of the Ruhr-Universität Bochum, Bochum, Germany
4. Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, CN Utrecht, The Netherlands