Received: 9 May 2020
Accepted: 29 July 2020
First Online: 31 August 2020
Ethics approval and consent to participate
: After permission obtained from Dr. Tim S. Ayers, the Ethics Committee of University of Isfahan (ID IR.UI.REC.1398.063) has granted requisite ethical approvals. A written informed consent was taken from the children and their parents. They were informed about confidentiality of information, their voluntariness in participation, and no foreseeable risk and harm in the study.
: Not applicable.
: The authors declare that they have no competing interests.