1. Head and Neck Research Group, HØKH, Research Centre, Akershus University Hospital, Lørenskog.
2. Faculty Division Akershus University Hospital, University of Oslo, Nordbyhagen.
3. Faculty Division Ullevål University Hospital, University of Oslo, Oslo, Norway.
4. Institute for Special Needs Education, University of Oslo, Oslo, Norway.
5. Department of Neurology, Ullevål University Hospital, Oslo, Norway.
6. HØKH, Research Centre, Akershus University Hospital, Lørenskog.