1. Department of Visceral, Thoracic, Transplant and Vascular Surgery; University Hospital of Leipzig; Leipzig Germany
2. Department of Plastic, Hand and Reconstructive Surgery; Hannover Medical School; Hannover Germany
3. Department of Medical Psychology and Medical Sociology; University Hospital of Leipzig; Leipzig Germany
4. Department of General, Visceral and Transplant Surgery; Charité-Universitätsmedizin Berlin; Berlin Germany