Funding for this research was provided by:
Tehran University of Medical Sciences (IR.TUMS.VCR.REC.1396.4610)
Received: 21 November 2019
Accepted: 27 January 2021
First Online: 15 February 2021
Ethics approval and consent to participate
: We obtained both oral and written informed consent from participants and their parents/guardians prior to interviews. The Ethics Committee of Tehran University of Medical Sciences approved the study protocol (IR.TUMS.VCR.REC.1396.4610.).
: All authors have provided consent for publication.
: The authors declare that they have no competing interests.