Funding for this research was provided by:
Tehran University of Medical Sciences
Received: 15 December 2020
Accepted: 8 June 2021
First Online: 6 August 2021
: The procedures were fully explained to the participants and their parents. Ethics committee of Tehran University of Medical Sciences approved the final methods (Number: IR.TUMS.VCRREC.1996.2506). Parents of participants had access to all information. They were informed that participation was optional and withdrawal was possible whenever they asked for.
: Not applicable.
: The authors declare that they have no competing interests.