1. Ruprecht Karls University Heidelberg, Faculty of Medicine Mannheim, Mannheim, Germany
2. Department of Otorhinolaryngology, Head and Neck Surgery, University Medical Centre Mannheim, Mannheim, Germany
3. Department of Plastic Surgery, University of Pittsburgh, Pittsburgh Pennsylvania
4. HNO-Zentrum Rhein-Neckar, Mannheim, Germany
5. Department of Otolaryngology, University Hospital Lewisham, Lewisham, London, United Kingdom