Received: 1 December 2020
Accepted: 15 January 2021
First Online: 1 February 2021
Ethics approval and consent to participate
: Ethical approval was obtained before conducting the study from the Ethics’ Committee of High Institute of Public Health, Alexandria University, Alexandria, Egypt (ethics committee reference number: not applicable). After explaining the study’s purpose, all participants were provided with informed written online consent for participation and publication. For those who were less than 16 years old, informed written parental consent was obtained.
: All participants and parents of those who were less than 16 years old provided an informed written consent for publication.
: The authors declare that they have no competing interests.