1. Department of Otorhinolaryngology, Plastic, Aesthetic and Reconstructive Head and Neck Surgery, University Hospital of Würzburg, Würzburg, Germany
2. Department of Oto-Rhino-Laryngology, Head and Neck Surgery, University of Oldenburg, Oldenburg, Germany
3. Department of Otorhinolaryngology, Head and Neck Surgery, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
4. Department of Otorhinolaryngology, Head and Neck Surgery, HELIOS Klinikum München West, Munich, Germany
5. MED-EL Medical Electronics, Innsbruck, Austria