1. Department of Logopedics; Abo Akademi University; Turku Finland
2. Turku Institute for Child and Youth Research; University of Turku; Turku Finland
3. Department of Paediatrics and Adolescent Medicine; Turku University Hospital and University of Turku; Turku Finland
4. Department of Speech and Language Pathology; University of Turku; Turku Finland
5. Biostatistics; Department of Clinical Medicine; University of Turku; Turku Finland