1. Department of ENT - Head and Neck Surgery; County Council of Östergötland; Linköping Sweden
2. Department of Clinical Pathology and Department of Clinical and Experimental Medicine; Linköping University; Linköping Sweden
3. Division of Oto-Rhino-Laryngology and Head and Neck Surgery; Department of Clinical and Experimental Medicine; Linköping University; Linköping Sweden
4. Department of Immunology, Genetics and Pathology and Science for Life Laboratory; Rudbeck Laboratory; Uppsala University; Uppsala Sweden