Received: 8 June 2020
Accepted: 12 August 2020
First Online: 25 August 2020
Ethics approval and consent to participate
: The study was performed after the ethical committee approval in accordance in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. The study was approved by the ethical committee of Faculty of Medicine, Ain-Shams University. Oral informed consent for participation was given by the patients’ parent or legal guardian. As the study imposes no additional risk to the participants, the committee’s reference number was exempted.
: Identifying information about participants (patients’ identity) did not appear in any part of the manuscript; therefore, consent for publication was not required.
: The authors declare that they have no conflict of interest.