1. Research Center for Health Sciences, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran
2. Department of Occupational Health Engineering, School of Health, Kashan University of Medical Sciences, Kashan, Iran
3. Gastrointestinal and Liver Diseases Research Center, Guilan University of Medical Sciences, Rasht, Iran
4. Department of Occupational Health Engineering, Sirjan School of Medical Sciences, Sirjan, Iran