Received: 18 September 2020
Accepted: 11 January 2021
First Online: 21 January 2021
Ethics approval and consent to participate
: Ethical approval was obtained from the Health and Life Sciences Committee on Research Ethics, University of Liverpool. Reference number 1147.
: Written consent was obtained from the donor for the retention of tissue for anatomical and histological examination and for the publication of our observations. A copy of the written consent is available for review by the Editor of this journal.
: The authors declare that they have no competing interests.