1. Department of Gastroenterology, Endocrinology, Diabetology and General Medicine, Klinikum Kassel Kassel Germany
2. Department of Gastroenterology and Oncology, Vivantes Klinikum Spandau Berlin Germany
3. Institute of Pathology, Martin Luther University Halle Germany
4. Germany and Institute of Pathology Cologne University Cologne Germany
5. Department of Surgery Martin Luther University Halle Germany
6. Department of Endocrine Surgery University Hospital Essen Essen Germany