**Author details**

Mushfique Alam, Robert Young and Rafael Diaz-Nieto\* Hepatobiliary Surgery Unit, Liverpool University Hospital, Liverpool, United Kingdom

\*Address all correspondence to: rafael.diaz-nieto@liverpoolft.nhs.uk

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
