1. Hepatobiliary and Pancreatic Surgery Unit, Queen Elizabeth Hospital Birmingham, Birmingham B15 2TH, UK
2. College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TH, UK
3. Department of Surgery, Trinity College Dublin, University of Dublin, Tallaght University Hospital, D24 NROA Dublin, Ireland
4. Department of Nutrition and Dietetics, St. Vincent’s University Hospital, D04 T6F4 Dublin, Ireland
5. Department of Nutrition and Dietetics, Royal Surrey County Hospital, Guildford GU2 7XX, UK