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Article History

Received: 5 August 2019

Accepted: 30 January 2020

First Online: 7 February 2020

Ethics approval and consent to participate

: This study was approved by the ethical committee of Helwan University School of Medicine on the 10th of September 2015. All parent or legal guardian of patients provided an informed written consent prior to participating in any study-related activities.

: Not applicable

: The authors declare that they have no competing interests.