1. Department of ENT-Head and Neck Surgery; UHL, County Council of Östergötland; Linköping; Sweden
2. Division of Oto-Rhino-Laryngology and Head and Neck Surgery; Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University; Linköping; Sweden
3. Division of Cell Biology; Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University; Linköping; Sweden