1. Department of Otorhinolaryngology, Head & Neck Surgery and Audiology, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark;
2. Department of Oncology, Section 5073, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark;
3. Department of Oncology, Center for Experimental Drug and Gene Electrotransfer, Herlev and Gentofte Hospital, University of Copenhagen, Herlev, Denmark