Received: 8 January 2019
Accepted: 29 April 2020
First Online: 6 July 2020
Ethics approval and consent to participate
: This research accepted by Research Ethics Committee (REC) of Faculty of Medicine, Benha University (chairman: Prof/ Ibrahim El-Gendy).All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. A written informed consent was obtained from each parent of participants after explaining all steps of this study.The reference number of the ethics approval from the ethics committee is as follows:F10, date: December 12, 2018. For any details, please contact responsible person: Professor Dr. Nermeen Adly, telephone: +201000071033, e-mail: ExternalRef removed.
: Available, it was obtained from adult patients and parents of children of the studied group.
: The authors declare that they have no conflict of interest.