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Article History

Received: 23 March 2020

Accepted: 9 July 2020

First Online: 30 July 2020

Competing interest

: The authors declare that they have no competing interests in this section.

: Written consents for the study were obtained from the parents after full explanation of the study procedures. The consents were obtained prior to the children’s enrollment in the study. The study protocol was approved by the Ethical Committees of Benha faculty of medicine ( The reference number of the ethical committee of Benha Faculty of Medicine is not available till now. I contacted the responsible person of the committee and she said that they are taking the steps nowadays to have a reference number in the international research board ‘IRB’, but they have not finished yet)

: The parents of the cases were consented to publish the study data with the maintenance of full anonymity.