Received: 30 October 2019
Accepted: 15 May 2020
First Online: 25 June 2020
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of the Faculty of Medicine at South Valley University in Qena, Egypt on 30 September 2014; Reference Number of approval is F36. Written informed consent of all patients for their participation was given by their parent or legal guardian.
: All parents of patients included in this research gave written informed consent to publish the data contained within this study.
: The authors declare that they have no competing interests.