1. Department of Psychology and Speech-Language Pathology, University of Turku, Turku, Finland
2. Pediatric Research Center, New Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
3. Faculty of Educational Sciences, University of Helsinki, Helsinki, Finland
4. Department for Deafblindness and Combined Vision and Hearing Impairments, STATPED, Oslo, Norway
5. Sense Scotland, Scotland, UK
6. City of Helsinki, Social Services and Health Care Division, Maternity and Child Health Clinics, Helsinki, Finland
7. Department of Psychology and Logopedics, University of Helsinki, Helsinki, Finland