Received: 27 March 2020
Accepted: 14 September 2020
First Online: 22 September 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the institutional review board of the Tehran University of Medical Sciences (Ethics Code: IR.TUMS.REC.1393-1312). Written informed consent was obtained from all students at least one of their parents prior to their participation.
: Not applicable.
: The authors declare that they have no competing interests.