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Lecture translated into Persian by
 
Sina Valiai, MSN student,College of  Nursing & Midwife, Tehran University of Medical Sciences (TUMS), Tehran, Iran 
 
Mehdi Osuly , School of Public Health and Institute of Public Health Research, Tehran University of Medical Sciences (TUMS), Tehran, Iran
 
Ali Ardalan MD,MPH,PhD Assistant Professor Health Emergency & Disaster Division (HE&DD)  Institute of Public Health Research (IPHR) Tehran University of Medical Sciences (TUMS) Tehran, Iran