Funding for this research was provided by:
Tarbiat Modares University
Received: 8 February 2019
Accepted: 29 July 2020
First Online: 26 August 2020
Ethics approval and consent to participate
: The study was registered by the ethics committee of Tarbiat Modares University under the code IR.TMU.REC.1396.727 and was in accordance with the Helsinki Declaration. We invited all of the available students that had been approved for participation by their school principal, and their parents; informed them about research design, aim, objectives, as well as voluntariness, confidentiality and their rights. They then agreed to participate in the study by completing and returning the questionnaire. The parents completed the written consent form.
: Not applicable.
: The authors declare that they have no competing interests.