1. Department of Otorhinolaryngology; Goethe-University; Frankfurt/M. Germany
2. Department of Otorhinolaryngology; University of Munich (LMU); Germany
3. Munich Biotech AG; Neuried Germany
4. Department of Clinical Radiology; University of Munich (LMU); Germany
5. Department of Otorhinolaryngology; University of Schleswig-Holstein; Campus Lübeck Germany