Received: 29 December 2018
Accepted: 1 August 2019
First Online: 12 August 2019
Ethics approval and consent to participate
: Ethics approval was provided by the local Ethical Committee of the Faculty of Medicine, Tanta University. Reference number 32769 was obtained on the 26th of December 2018. Consent for participation was not applicable as this is a retrospective study, so the ethical committee waived the consent to participate.
: Not applicable
: The authors declare that they have no competing interests.