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Background: Since 2008, dispatcher-assisted cardiopulmonary resuscitation (DA-CPR) has been running in Tehran, Iran. However, there are numerous cases that the emergency medical dispatchers (EMDs) did not provide DA-CPR or the bystander refused to perform CPR. The purpose of this study was to survey and identifypossible barriers to bystander resuscitation in out-of-hospital cardiac arrest (OHCA) cases…

