1. Division of Otolaryngology, Head and Neck Surgery, University Hospital Zurich, Frauenklinikstraße 24, 8091 Zurich, Switzerland
2. Institute of Surgical Pathology, University Hospital Zurich, Frauenklinikstraße 24, 8091 Zurich, Switzerland
3. Division of Dermatology, University Hospital Zurich, Frauenklinikstraße 24, 8091 Zurich, Switzerland