1. Department of Medical and Clinical GeneticsInstitute of Biomedicine, Sahlgrenska Academy at University of GothenburgGothenburg Sweden
2. Department of Clinical Pathology and GeneticsSahlgrenska University HospitalGothenburg Sweden
3. Department of SurgerySahlgrenska Academy at University of Gothenburg, Sahlgrenska University Hospital/ÖstraGothenburg Sweden
4. Mathematical Sciences, Chalmers University of TechnologyGothenburg Sweden
5. Department of PathologyInstitute of Biomedicine, Sahlgrenska Academy at University of GothenburgGothenburg Sweden
6. Department of Medical GeneticsRikshospitalet, University HospitalOslo Norway
7. Department of SurgerySkaraborg HospitalSkövde Sweden
8. The Swedish NMR‐Centre at University of GothenburgGothenburg Sweden
9. Department of MedicineThe Swedish Polyposis Registry, Karolinska InstituteStockholm Sweden