1. Environmental Health Dept, Faculty of Medical Sciences, Tarbiat Modarres University, P.O.Box: 14115-178, Tehran, Iran E-mail: rezadarvish86@yahoo.comabbasrezaee@yahoo.com
2. Environmental Health Dept, Faculty of Health, Lorestan University of Medical Sciences, P.O.Box: 441, Khorramabad, Iran E-mail: shams_lums@yahoo.com
3. Environmental Health Dept, Faculty of Health, Semnan University of Medical Sciences, P.O.Box: 373, Damghan, Iran E-mail: k_yaghmaeian@yahoo.com