1. Department of General, Visceral and Transplant Surgery, Tuebingen University Hospital, Tuebingen, Germany
2. Department of Research and Basic Technologies, Erbe Elektromedizin GmbH, Tuebingen, Germany
3. Department of Gynaecology and Obstetrics, Tuebingen University Hospital, Tuebingen, Germany
4. Department of Thoracic, Cardiac and Vascular Surgery, Tuebingen University Hospital, Tuebingen,Germany