1. Institute for Clinical and Experimental Surgery, University of Saarland, Homburg/Saar, Germany.
2. Department of Small Animal Surgery, Ludwig-Maximilians-University, Munich, Germany.
3. Department of Otorhinolaryngology, Head and Neck Surgery, University of Saarland, Homburg/Saar, Germany.
4. Department of Otorhinolaryngology, Klinikum Bremen-Mitte gGmbH, Bremen, Germany.