1. Upper Gastrointestinal Surgery, Department of Molecular Medicine and Surgery, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
2. Impact Assessment Unit, Department of Health Protection, National Institute for Health and Welfare, Tampere, Finland
3. Centre for Translational Microbiome Research, Department of Microbiology, Tumor, and Cell Biology, Karolinska Institutet, Stockholm, Sweden
4. Science For Life Laboratory (SciLifeLab), Karolinska Institutet, Stockholm, Sweden
5. Clinic of Gastroenterology, University of Helsinki, Helsinki University Hospital, Helsinki, Finland
6. Department of Public Health, University of Copenhagen, Copenhagen, Denmark
7. Finnish Cancer Registry, Institute for Statistical and Epidemiological Cancer Research, Helsinki, Finland
8. Faculty of Social Sciences, University of Tampere, Tampere, Finland
9. Department of Public Health and General Practice, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway
10. Icelandic Cancer Registry, Icelandic Cancer Society, Reykjavik, Iceland
11. Faculty of Medicine, University of Iceland, Reykjavik, Iceland
12. School of Cancer Sciences, King’s College London, London, United Kingdom