1. Department of Gastrointestinal and Paediatric Surgery Oslo University Hospital Oslo Norway
2. Department of Registration Cancer Registry of Norway Oslo Norway
3. Department of Research and Innovation Møre and Romsdal Hospital Trust Ålesund Norway
4. Department of Research Cancer Registry of Norway Oslo Norway
5. Division for Molecular Nutrition Institute of Basic Medical Sciences, University of Oslo Oslo Norway
6. Institute of Clinical Medicine, University of Oslo Oslo Norway