Affiliation: | Karen Stevenson PhD FRCS is a Specialty Registrar at the West of Scotland Pancreatico-biliary Unit, Glasgow Royal Infirmary, Glasgow, UK. Conflicts of interest: none declared; C Ross Carter MD FRCS is a Consultant Surgeon at the West of Scotland Pancreatico-biliary Unit, Glasgow Royal Infirmary, Glasgow, UK. Conflicts of interest: none declared |