Article History
Received: 24 January 2022
Accepted: 3 March 2022
First Online: 28 March 2022
<!--Emphasis Type='Bold' removed-->Declarations
:
: The study was approved by the local ethics committee of the Faculty of Medicine, Alexandria University. The study was explained to the participants and their parents and a written consent was taken from parents of all children included in the study.
: Not applicable.
: The authors declare that they have no competing interests.