Received: 16 July 2019
Accepted: 15 April 2020
First Online: 11 May 2020
Ethics approval and consent to participate
: The ethics committee of the Faculty of Medicine, Cairo University, approved this study. Written informed consents were obtained from the participants’ guardians before being involved in this study. The work has been carried out in accordance with the code of ethics of the World Medical Association (Declaration of Helsinki) for experiments in human patients
: Not applicable.
: The authors declare that they have no competing interests.