1. Department of Gastroenterological Surgery, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
2. Department of Digestive Surgery, Turku University Hospital and University of Turku, Turku, Finland
3. Department of Gastroenterological Surgery, Tampere University Hospital, Tampere, Finland
4. Human Microbiome Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland
5. Applied Tumor Genomics, Research Programs Unit, University of Helsinki, Helsinki, Finland