mostafa hamzeiyan ziarani m.sc. department of industrial engineering, institute for higher education of kar, qhazvin, iran adel mazloumi 2) ph.d. department of occupational health engineering, school of public health, tehran university of medical sciences, tehran, iran mehdi jahangiri 3) ph.d. department of occupational health engineering, school of public health and nutrition, shiraz university of medical sciences, shiraz, iran zeinab kazemi 4) phd candidate. department of occupational health engineering, school of public health, tehran university of medical sciences, tehran, iran mansour ziaei 5) phd candidate. department of occupational health engineering, kermanshah university of medical sciences, kermanshah, iran parissa mohadesy 6) b.sc. occupational health unit, hse bu-ali sina petrochemical company, mahshahr, iran