Received: 4 October 2019
Accepted: 23 October 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: This study was approved by the research ethics committee of the Faculty of Medicine at Ain Shams University in Egypt on 25 December 2010. Written informed consent for participation in the study was given by the patients’ parents or their legal guardians.
: Written informed consent for the publication of this data was given by the patients’ parents or their legal guardians.
: The authors declare that they have no competing interests.