1. Department of Otorhinolaryngology; University Hospitals of Cologne; Cologne Germany
2. Department of Otorhinolaryngology; Jena University Hospital; Jena Germany
3. Department of Otorhinolaryngology; University of Halle-Wittenberg; Halle-Wittenberg Germany
4. Department of Otorhinolaryngology; Universitätsmedizin Charité Berlin/HNO Zentrums am Kudamm; Berlin Germany
5. Department of Otorhinolaryngology; University of Mainz; Mainz Germany
6. Department of Otorhinolaryngology; Head and Neck Surgery, University Hospital Mannheim; Mannheim Germany
7. Department of Otorhinolaryngology; Head and Neck Surgery , University Hospital Regensburg; Regensburg Germany
8. Departments of Otorhinolaryngology; University of Magdeburg and Sana Ohren-Klinikum; Haldensleben Germany
9. Department of Otorhinolaryngology Head and Neck Surgery; University Clinics of Greifswald; Greifswald Germany
10. Institute of Experimental and Clinical Pharmacology and Toxicology; University of Erlangen-Nürnberg; Erlangen Germany
11. Department of Otorhinolaryngology; Smell and Taste Clinic, Technical University of Dresden Medical School; Dresden Germany