1. Department of Clinical Science, Intervention and Technology, Division of SurgeryKarolinska Institutet Stockholm Sweden
2. Department of SurgerySkellefteå County Hospital Skellefteå Sweden
3. Department of SurgeryOdense University Hospital Odense Denmark
4. Department of Clinical SciencesLund University Lund Sweden
5. Department of SurgerySkåne University Hospital Lund Sweden
6. Department of Digestive SurgeryKarolinska University Hospital Stockholm Sweden