Received: 6 May 2019
Accepted: 24 May 2021
First Online: 13 September 2021
: Ethical approval was obtained from the ethics committee, faculty of medicine Alexandria university. Consent for participation in the current study was obtained from all participants, 5 were adults and a direct consent was obtained from them and 13 were children under 18 years of age and consent was obtained from their parents.
: Not applicable.
: The authors declare that they have no competing interests