Affiliation: | 1. Medical Faculty, Department of Otorhinolaryngology, Head and Neck Surgery, University of Cologne, Cologne, Germany;2. Jean Uhrmacher‐Institute for Clinical, ENT‐Research, University of Cologne, Cologne, Germany;3. Department of Otorhinolaryngology, Head and Neck Surgery, University Medical Center G?ttingen, G?ttingen, Germany |