Received: 23 September 2019
Accepted: 29 September 2020
First Online: 11 December 2020
Ethics approval and consent to participate
: The ethical considerations of the study such as the required information about the research objectives, voluntary participation in the study, and confidentiality of data were fully explained to the parents. After the completion of the consent forms by parents, they received the questionnaires and their children were subsequently examined. It should be noted that the present study was approved by the Ethics Committee of the Vice-Chancellor’s Office for Research at Shahid Sadoughi University of Medical Sciences, Yazd, Iran; with the code of ethics: IR.SSU.SPH.REC.1397.109.
: Not applicable.
: The authors would like to declare that there is no conflict of interest regarding the publication of this article.