Received: 18 June 2020
Accepted: 26 August 2020
First Online: 15 September 2020
Ethics approval and consent to participate
: Approval of research ethical committee of Faculty of Medicine, Ain Shams University was obtained (code number:FMASU M D 44/ 2018) and written informed consent was obtained from all parents of the patients.
: Not applicable.
: The authors declare that they have no competing interests.