Received: 12 August 2020
Accepted: 9 November 2020
First Online: 1 December 2020
Ethics approval and consent to participate
: The local Ethics Committee of Shiraz University of Medical Sciences approved the study protocol (number 7173). Permissions were also received through the authorities in the schools. Written informed consent was collected from all the participants and the parent or legal guardian of participants under 16 years old.
: Not applicable
: The authors declare no conflict of interest.