hossein hatami md, mph, professor of infectious diseases and public health, director of mph department, shahid beheshti university of medical sciences, tehran, ir iran abdolkazem neisi environmental health department, environmental technologies research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran mohsen kooti msc, environmental heath engineering, mph, shahid beheshti university of medical sciences, tehran, ir iran; risk reduction and disaster management officer, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; environmental heath engineering, shahid beheshti university of medical sciences, tehran, ir iran