Affiliation: | 1. Child Language Research Center, Faculty of Humanities, University of Oulu, Oulu, Finland;2. PEDEGO Research Unit, Institute of Clinical Medicine, University of Oulu, Oulu, Finland;3. Department of Obstetrics and Gynaecology, Oulu University Hospital, Oulu, Finland;4. Department of Obstetrics and Gynaecology, Turku University Hospital, Turku, Finland;5. Department of Paediatrics, Oulu University Hospital, Oulu, Finland;6. Statistical Consulting, Oulu, Finland |