1. Department of Gastroenterology, Hepatology and Endocrinology Hannover Medical School Hannover Germany
2. Department of Internal Medicine I University Hospital Halle (Saale) Halle (Saale) Germany
3. Department of Internal Medicine and Gastroenterology Sankt Bernward Hospital Hildesheim Hildesheim Germany
4. Department of Cardiology, Angiology and Intensive Care Klinikum Hildesheim Hildesheim Germany