1. Department of Otorhinolaryngology—Section of Head and Neck SurgeryGoethe‐University Medical Center Frankfurt/Main Germany
2. Department of Otorhinolaryngology—Section of PhoniatricsGoethe‐University Medical Center Frankfurt/Main Germany
3. Department of Otorhinolaryngology—Head and Neck SurgeryJohannes Gutenberg‐University Medical Center Mainz Germany
4. Department of Otorhinolaryngology—Section of PhoniatricsLudwig‐Maximilians‐University Medical Center Munich Germany