Received: 27 February 2020
Accepted: 1 July 2020
First Online: 8 September 2020
Ethics approval and consent to participate
: The study was performed according to the ethical guidelines of the 1975 Declaration of Helsinki. The current study was approved by the Medical Research Ethical Committee of the Faculty of Medicine, Benha University. All subjects were informed about the procedures and the aim of the study, and informed written consent was obtained from the parents or caregivers of enrolled children. The committee’s reference number is not applicable and/or not available.
: Not applicable
: None of the authors have any conflicts of interest or financial disclosures related to this work.