1. Department of Otorhinolaryngology; Institute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg, Sahlgrenska University Hospital; Gothenburg Sweden
2. Department of Oncology; Institute of Clinical Sciences, Sahlgrenska Academy at the University of Gothenburg, Sahlgrenska University Hospital; Gothenburg Sweden
3. AstraZeneca; Research and Development; Mölndal Sweden
4. Department of Anesthesiology and Intensive Care; Sahlgrenska University Hospital/Mölndal; Mölndal Sweden