1. College of Medical and Dental Scientists, University of Birmingham , Birmingham , UK
2. Liver Unit, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham UK , Birmingham , UK
3. Department of Academic Surgery, University of Birmingham , Birmingham , UK
4. Department of Hepatobiliary Surgery, St James’ Hospital , Leeds , UK
5. Department of UGI Surgery, Heartlands Hospital, University Hospitals Birmingham , Birmingham , UK
6. Nuffield Department of Surgery, University of Oxford , Oxford , UK