Received: 26 November 2019
Accepted: 28 November 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation, the Institutional Review Board (IRB) of Alexandria General Hospital on 14th February 2017 and with the Helsinki Declaration of 1964 and later versions. The committee's reference number is unavailable (not applicable). No consent was obtained from the patients since it was a retrospective study.
: All patients included in this research gave written informed consent to publish the data contained within this study.
: The authors declare that they have no competing interests.