Funding for this research was provided by:
Mashhad University of Medical Sciences (980861)
Received: 23 September 2020
Accepted: 14 December 2020
First Online: 4 January 2021
Ethics approval and consent to participate
: The study was approved by the ethics committee of the Research Department of Mashhad University of Medical Sciences protocol number: IR.MUMS.MEDICAL.REC.1399.146. Inform consent was not obtained due to the nature of the study and the ethical committee approved that.
: Not applicable because we used the data of EMS center which did not include any identification items.
: The authors declare that they have no competing interests.