Received: 9 May 2020
Accepted: 25 August 2020
First Online: 7 October 2020
Ethics approval and consent to participate
: The current research was approved by the Institutional Ethical Committee of the Faculty of Medicine, Aswan University (EC Ref No: aswu/456/5/20). Also, written informed consents were obtained from all parents to participate in the research.
: Written informed consents for publication were obtained from all parents.
: The authors declare that they have no competing interests.