Received: 9 January 2020
Accepted: 24 May 2020
First Online: 27 July 2020
Ethics approval and consent to participate
: This study was approved by the local research ethical committee of Ain Shams University, Faculty of Medicine in the Declaration of Helsinki (FMASU REC). The study was approved in October 2015 by pediatric department committee. A written consent was taken from children’s legal guardians. All subjects were explained about the purpose of the study and were ensured that the information collected from them would be confidential and used only for academic purpose.