Received: 25 November 2021
Accepted: 5 May 2022
First Online: 14 May 2022
: The study ethical review was conducted by the Scientific Ethical Committee of the Faculty of Medicine, Damascus University and approved according to the principles embodied in the Declaration of Helsinki (Approval ID: 91–21-2–2019). All relevant guidelines were followed for the study and all participants received a thorough explanation about the research and that it is conducted for academic purposes only.An Informed consent to participate was obtained from each participant and witnessed by the representative of the School Health Department in each institution. For younger children (< 13-year-old), Informed consent was obtained from their parents/guardians in addition to their voluntary willingness to participate.
: Not Applicable.
: The authors declare that the research was conducted in the absence of any commercial, financial, or non-financial relationships that could be construed as a potential conflict of interest.