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Article History

Received: 12 July 2019

Accepted: 30 October 2019

First Online: 9 December 2019

Ethics approval and consent to participate

: This study was reviewed and approved by the Research Ethics Committee of the Faculty of Medicine, Ain Shams University (Ethics committee reference number 136/2015).

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed written consent was obtained from all individual participants included in the study.

: Not applicable.

: The authors declare that they have no competing interests.