1. Department of Otorhinolaryngology, Head and Neck SurgeryUniversity Hospital Zurich Zurich Switzerland
2. Institute of Pathology and Molecular PathologyUniversity Hospital Zurich Zurich Switzerland
3. Department of Otolaryngology, Head and Neck SurgeryMcGill University Montreal Québec Canada
4. Department of Otorhinolaryngology, Head and Neck SurgeryKantonsspital St. Gallen St. Gallen Switzerland