Farid, Ashraf Mohamed http://orcid.org/0000-0002-8891-5867
ElKheshin, Sherif Elsayed
Article History
Received: 5 July 2019
Accepted: 16 October 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: Approved from the research ethics committee of Faculty of Medicine at Tanta University [reference number 33038 obtained in April 2019]. Consent for participation was not applicable as this is a retrospective study, so the ethics committee waived the consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.