1. inomed Medizintechnik GmbH, Emmendingen, Germany
2. Department of Otolaryngology of the Charité, Berlin, Germany
3. Spinal Cord Injury Center, Heidelberg University Hospital, Heidelberg, Germany
4. Department of General and Abdominal Surgery of the University Medical Center, Johannes Gutenberg University, Mainz, Germany
5. Fraunhofer-Institut für Biomedizinische Technik, Sulzbach, Germany