1. Division of Clinical Epidemiology and Aging Research; German Cancer Research Center (DKFZ); Heidelberg Germany
2. Saarland Cancer Registry; Saarbrücken Germany
3. Gastroenterological Practice Völklingen; Germany
4. Division of Preventive Oncology; German Cancer Research Center (DKFZ), National Center for Tumor Diseases (NCT); Heidelberg Germany
5. German Cancer Consortium (DKTK); German Cancer Research Center (DKFZ); Heidelberg Germany