1. Rudolf-Frey Teaching Department, University Medical Center of the
Johannes Gutenberg University Mainz, Mainz, Germany
2. Department of Otorhinolaryngology, Universitätsklinikum
Regensburg, Regensburg, Germany
3. Department of Otorhinolaryngology, University Medical Center Bonn,
Bonn, Germany
4. Department of Otorhinolaryngology, Head & Neck Surgery,
Saarland University Hospital and Saarland University Faculty of Medicine,
Homburg, Germany
5. Department of Otorhinolaryngology, Head and Neck Surgery, University of
Tübingen Medical Center, Tuebingen, Germany
6. Department of Radiology and Nuclear Medicine, University Medical Centre
Mannheim, Mannheim, Germany
7. Department of Otorhinolaryngology, Head and Neck Surgery, University
Medical Centre Mannheim, Mannheim, Germany
8. Department of Oral and Maxillofacial Surgery, Medical Faculty and
University Hospital Düsseldorf, Duesseldorf, Germany
9. Department of Otorhinolaryngology, Head and Neck Surgery, Paracelsus
Medical University, Nuremberg, Germany
10. Department of Otorhinolaryngology, Plastic Head and Neck Surgery, RWTH
Aachen University Hospital, Aachen, Germany
11. Department of Otorhinolaryngology, University Medical Center Freiburg,
Freiburg, Germany
12. Department of Otorhinolaryngology, Head and Neck Surgery, Technical
University of Munich Hospital Rechts der Isar, Munich, Germany
13. Department of Radiology, LMU University Hospital, Munich,
Germany
14. Ultrasound Division, Otorhinolaryngology Center Münsterland,
Münster, Germany