1. Department of Otorhinolaryngology, Head and Neck Surgery, Institute of Clinical Sciences, Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
2. Department of Otorhinolaryngology, Head and Neck Surgery Region Västra Götaland, Sahlgrenska University Hospital Gothenburg Sweden
3. Department of Clinical Science, Intervention and Technology (CLINTEC) Karolinska Institute Stockholm Sweden
4. Department of Abdominal Radiology Karolinska University Hospital Stockholm Sweden