fa عمومى General پژوهشي Research <div style="text-align: justify;">Hajj is one of the most important religious ceremonies of Muslims that is held in Saudi Arabia every year. However, trauma is the most important factor of mortality in this ceremony.</div> Establishment of Surveillance System 163 164 http://hdq.uswr.ac.ir/browse.php?a_code=A-10-189-5&slc_lang=fa&sid=1 Hasan Ghodsi No Department of Health in Disasters and Emergencies, School of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Davoud Khorasani-Zavareh davoud.khorasani@gmail.com Yes Department of Health in Disasters and Emergencies, School of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Ali Khodadadizadeh No Safety Promotion and Injury Prevention Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Sadegh Yusefnezhad No Department of Health in Disasters and Emergencies, School of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, Tehran, Iran.