1. Department of Visceral-, Transplant-, and Thoracic Surgery; Medical University; Innsbruck Austria
2. Department of General; Visceral, Vascular and Thoracic Surgery; Charité Campus Mitte; Berlin Germany
3. Department of Anaesthesia and Intensive Care Medicine; Medical University; Innsbruck Austria
4. Department of Internal Medicine II, Gastroenterology & Hepatology; Medical University; Innsbruck Austria
5. Department of Biostatistics, Coordination Center for Clinical Trials; Charité Universitätsmedizin Berlin; Berlin Germany
6. Department of Medical Statistics; Medical University; Innsbruck Austria
7. Department of General, Visceral and Transplant Surgery; Charité Campus Virchow-Klinikum; Berlin Germany
8. Department of Internal Medicine; District Hospital Hall; Innsbruck Austria