1 Department of Business Economics, Erasmus School of Economics, Erasmus University Rotterdam, The Netherlands.
2 Department of Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands.
3 Department of Clinical Genetics, Erasmus MC Cancer Institute, University Medical Center Rotterdam, Rotterdam, The Netherlands.
4 Department of Genetics, University Medical Center Groningen, Groningen, The Netherlands.
5 Deparment of Clinical Genetics, Netherlands Cancer Institute, Amsterdam, The Netherlands.
6 Department of Gastrointestinal Oncology, Netherlands Cancer Institute, Amsterdam, the Netherlands, Department of Gastroenterology and Hepatology, Leiden University Medical Center, Leiden, the Netherlands. Electronic address: [email protected].