Received: 6 July 2021
Accepted: 29 October 2021
First Online: 22 November 2021
: This study was conducted according to the Declaration of Helsinki for medical research on humans and after obtaining local ethics approval from Ethics Committee at Benha Faculty of Medicine (REC: IDIRB2017122601) and informed written consent to participate in this study was obtained from all participants’ parents/legal guardians for all children under 16 years old.
: Not applicable.
: The authors declare that they have no competing interests.