1. Division of Speech Language Pathology, Phoniatrics and Audiology, Department of Clinical Sciences in Lund Lund University Lund Sweden
2. Division of Speech Language Pathology, Department of Otorhinolaryngology Skåne University Hospital Malmö Sweden
3. Division of Surgery, Department of Clinical Sciences in Malmö Lund University Lund Sweden
4. Division of Plastic and Reconstructive Surgery Skåne University Hospital Malmö Sweden
5. Department of Statistics, USBE Umeå University Umeå Sweden