1. Department of Otorhinolaryngology Medical University of Innsbruck Innsbruck Austria
2. Department of Anatomy, Histology & Embryology Division of Clinical & Functional Anatomy Medical University of Innsbruck Innsbruck Austria
3. Department of Surgical Sciences, Head and Neck Surgery Section of Otolaryngology Uppsala University Hospital Uppsala Sweden
4. Tirol Kliniken University Clinics Innsbruck Innsbruck Austria