1. 1Department of Internal Medicine IV, University Hospital, LMU Klinikum, Ludwig Maximilian University of Munich, Munich, Germany
2. 2Department of Endocrinology, Diabetology and Clinical Nutrition, University Hospital Zurich (USZ) and University of Zurich (UZH), Zurich, Switzerland
3. 3Institute for Diabetes and Cancer (IDC), Helmholtz Center Munich, German Research Center for Environmental Health, Neuherberg, Germany
4. 4Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
5. 5Department of Internal Medicine III, University Hospital Carl Gustav Carus Dresden, Technische Universität Dresden, Dresden, Germany
6. 6Institute for Medical Information Processing, Biometry, and Epidemiology (IBE), Ludwig Maximilian University of Munich, Munich, Germany
7. 7Institute for Clinical Genetics, Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
8. 8National Center of Genetics, Laboratoire National de Santé, Dudelange, Luxembourg
9. 9German Cancer Consortium, Dresden, Germany
10. 10Institute of Pathology, Ludwig Maximilian University of Munich, Munich, Germany
11. 11Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
12. 12Department of Visceral and Transplantation Surgery, University Hospital, Zurich, Switzerland
13. 13Department of Otorhinolaryngology, University Hospital Zurich, Zurich, Switzerland
14. 14Department of Radiopharmaceutical and Chemical Biology, Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany
15. 15Faculty of Chemistry and Food Chemistry, School of Science, Technische Universität Dresden, Dresden, Germany
16. 16Division of Endocrinology and Diabetes, Department of Medicine I, University Hospital Würzburg, University of Würzburg, Würzburg, Germany
17. 17Department of Nuclear Medicine, University Hospital, LMU Klinikum, Ludwig Maximilian University of Munich, Munich, Germany
18. 18Department of General-, Visceral-, and Transplant-Surgery, University Hospital, LMU Klinikum, Ludwig Maximilian University of Munich, Munich, Germany
19. 19Green Templeton College, University of Oxford, Oxford, UK
20. 20NET Unit, ENETS Centre of Excellence, Royal Free Hospital, London, UK
21. 21Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA