1. Department of Oto-Rhino-Laryngology; Plastic, Aesthetic and Reconstructive Head and Neck Surgery and the Comprehensive Hearing Center, University of Wuerzburg; Würzburg Germany
2. Department of Otorhinolaryngology, Head and Neck Surgery “Otto Koerner”; Rostock University Medical Center; Rostock Germany
3. Department of Oto-Rhino-Laryngology, Head and Neck Surgery; University of Oldenburg; Oldenburg Germany