Received: 31 July 2020
Accepted: 12 January 2021
First Online: 29 January 2021
Ethics approval and consent to participate
: This research protocol was approved by the Ethics committee of the Pediatric Department, Ain Shams University.Committee Reference number: not available and not applicable as this was not a clinical trial (we did nothing to the patients for the sake of the study).This was a retrospective study, all data were recruited from the files. No sampling, experiments, or even clinical examination were done for the patients for the sake of this research work.
: Written informed consents were obtained from the participants’ parents or their legal guardians in children who are under the age of 16 years.