1. Faculty of Behavioral Sciences, Division of Cognitive and Neuropsychology, University of Helsinki, Helsinki, Finland
2. Helsinki University Central Hospital, Department of Phoniatrics, Helsinki, Finland
3. Kela—The Social Insurance Institution of Finland, Finland
4. Biomedicum, Research Programs Unit, Molecular Neurology, University of Helsinki, Finland
5. Helsinki University Central Hospital, Department of Neurology, Helsinki, Finland
6. Lecturer of pediatrics, retired