1. Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg, Germany
2. Division of Preventive Oncology, German Cancer Research Center (DKFZ) and National Center for Tumor Diseases (NCT), Heidelberg, Germany
3. German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany
4. Division of Biostatistics, German Cancer Research Center (DKFZ), Heidelberg, Germany
5. Department of Internal Medicine I, Ulm University, Ulm, Germany
6. Practice of Gastroenterology, Dornstadt, Germany
7. Practice of Internal Medicine, Ulm, Germany
8. Practice of Gastroenterology, Völklingen, Germany
9. Practice of Gastroenterology, Leverkusen, Germany
10. Department of Clinical Pharmacology and Pharmacoepidemiology, University Hospital Heidelberg, Heidelberg, Germany