mostafa mohammadian 1. student research committee, kerman university of medical sciences , kerman, iran. alireza choobineh 2. dept. of occupational health engineering, shiraz university of medical sciences , shiraz, iran. aliakbar haghdoost 3. research centre for modeling in health, institute for future studies in health, kerman university of medical sciences , kerman, iran. naser hasheminejad 4. dept. of occupational health engineering, kerman university of medical sciences , kerman, iran.