Received: 12 November 2019
Accepted: 2 March 2020
First Online: 7 May 2020
Ethics approval and consent to participate
: The study was approved by local Ethical Committee of Faculty of Medicine, Minia University with a reference number of 66-7/2018.
: No consent for publication was obtained from the patients as all the images used are entirely unidentifiable and there are no personal data included in the manuscript that can be traced to an individual patient.
: The authors declare that they have no competing interests.