1. Department of Otorhinolaryngology
2. Department of Otorhinolaryngology; University Hospital Muenster (m.k., d.w.); Muenster
3. Department of Radiotherapy and Radiooncology; University Medical Center Göttingen; Göttingen
4. Department of Otorhinolaryngology (m.d.)
5. Department of Radiotherapy and Radiooncology; Hannover Medical School; Hannover Germany