1. Department of Hepato‐Pancreato‐Biliary SurgeryOslo University Hospital Oslo Norway
2. Department of Clinical SurgeryUniversity of Edinburgh Royal Infirmary, Edinburgh UK
3. Department of SurgeryMaastricht University Centre Maastricht the Netherlands
4. Department of SurgeryRheinisch‐Westfälische Technische Hochschule Universitätsklinikum Aachen Aachen Germany