1. Department of Otorhinolaryngology, Ulm University, 89075 Ulm, Germany.
2. Department of Otorhinolaryngology, University of Lübeck, 23538 Lübeck, Germany.
3. Institute for Immunology and Transfusion Medicine, University of Lübeck, 23538 Lübeck, Germany.
4. Institute for Medical Molecular Biology, University of Lübeck, 23538 Lübeck, Germany.
5. Medical Department I, University of Lübeck, 23538 Lübeck, Germany.
6. Roche Diagnostics GmbH, Penzberg, 82372 Germany.
7. Department of Otorhinolaryngology, University of Duisburg-Essen, Essen, 45122 Germany.