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Article History

Received: 3 July 2021

Accepted: 17 December 2021

First Online: 31 January 2022

Declarations

:

: This study was conducted in accordance with the Institutional Research Ethics and the declaration of Helsinki. Approval of the ethical committee at Al Azhar faculty of medicine for boys was obtained with reference number R-12-2536. The reference number for ethical committee approval is not available. Participation in the study was completely voluntary with the anonymity of the participants. At the beginning of data collection, there was a written informed consent that must be approved by children’s family. Confidentiality of the collected data was strictly maintained.

: Not applicable

: The authors declare that they have no competing interests.