1 Department of HPB Surgery and Liver Transplantation, Clinical Service of HPB Surgery and Liver Transplantation, Royal Free London NHS Foundation Trust, UCL Partners, Pond Street, London, NW3 2QG, UK.
2 Division of Surgery and Interventional Science, University College London, London, UK.
3 The Princess Grace Hospital (HCA Healthcare UK), London, UK.
4 Institute for Sport Exercise and Health (ISEH), University College Hospital London, London, UK.
5 Department of Trauma and Orthopaedics, University College London Hospitals NHS Foundation Trust, London, London, UK.
6 Department of HPB Surgery and Liver Transplantation, Clinical Service of HPB Surgery and Liver Transplantation, Royal Free London NHS Foundation Trust, UCL Partners, Pond Street, London, NW3 2QG, UK. joerg-matthias.pollok@nhs.net.
7 Division of Surgery and Interventional Science, University College London, London, UK. joerg-matthias.pollok@nhs.net.