1. Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, Germany
2. Department of Respiratory Medicine, Hannover Medical School, Hannover, Germany
3. Department for Heart-, Transplantation- and Vascular Surgery, Hannover Medical School, Hannover, Germany
4. Department for Vascular Surgery, University Hospital Zurich, Zurich, Switzerland