Received: 26 March 2020
Accepted: 20 May 2020
First Online: 29 July 2020
Ethics approval and consent to participate
: Approval of the Ethics Committee of Ain Shams University Hospital in 2014. Reference number is not available. Informed written consent was obtained from the parents of all patients to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.