Received: 16 March 2021
Accepted: 30 August 2021
First Online: 12 September 2021
: This study was approved by the local ethical committee for research involving human subjects in Faculty of Medicine—Benha University (the approval number is not available). The study was carried out according to the guidelines of the Declaration of Helsinki. Ethical permission, and written consents were obtained from parents/guardians after being fully informed about the study and its procedures.
: Not applicable.
: The authors have no conflicts of interest to declare that are relevant to the content of this article.