1. Department of Human Genetics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
2. Department of Pathology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
3. Department of Surgical Research, Universitätsklinikum Carl Gustav Carus, Technische Universität Dresden, Germany
4. Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
5. Family Cancer Clinic, The Netherlands Cancer Institute, Amsterdam, The Netherlands
6. Department of Clinical Genetics, VU Medical Center, Amsterdam, The Netherlands
7. Department of Human Genetics, Academic Medical Center, Amsterdam, The Netherlands
8. Center for Human and Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands
9. Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
10. Department of Clinical Genetics, Erasmus Medical Center Rotterdam, Rotterdam, The Netherlands
11. Institute of Human Genetics, University of Bonn, Germany
12. Institute of Pathology, University of Bonn, Germany
13. University Hospital of the Ludwig‐Maximilians‐University, Campus Innenstadt, Munich, Germany
14. Center of Medical Genetics, Munich, Germany
15. Institute of Pathology, Department of Applied Tumor Biology, University Hospital Heidelberg, Heidelberg, Germany
16. Department of Human Genetics, Ruhr‐University Bochum, Germany
17. Institute of Human Genetics, Heinrich‐Heine‐University, Duesseldorf, Germany
18. Unit of Genetics, Institut Central des Hôpitaux Valaisans, Sion, Switzerland
19. Wessex Regional Genetics Laboratory, Salisbury District Hospital, Salisbury, Wiltshire, United Kingdom
20. Department of Internal Medicine, Brigham and Women's Hospital, Boston, Massachusetts
21. Department of Clinical Cancer Genetics, City of Hope, Duarte, California
22. Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, Canada
23. Hereditary Gastrointestinal Cancer Genetic Diagnosis Laboratory, Department of Pathology, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong