Received: 15 April 2020
Accepted: 25 January 2021
First Online: 8 February 2021
Ethics approval and consent to participate
: The study protocol was reviewed and approved by the ethical committee of the Faculty of Medicine, Beni-Suef University, under committee reference number <i>FMBSU-REC/06092019</i>. Informed written consent was obtained from one of the parents of children prior enrollment in this study recruitment.
: All authors declare that they read and accept the final form of the revised manuscript before submission.
: The authors declare that they have no competing interests.