Received: 24 October 2020
Accepted: 22 June 2021
First Online: 5 July 2021
: Full written informed consent was obtained from all patients’ guardians before their inclusion in the study. The protocol was approved by the Research Ethics Committee of Faculty of Medicine; Ain Shams University (approval no. FMASU MS 75/2018). The study was performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments.
: Not applicable.
: The authors declare that they have no conflict of interest.