1. School of Medicine University of Eastern Finland Kuopio Finland
2. Department of Pediatrics Mikkeli Central Hospital Mikkeli Finland
3. Finnish Institute for Health and Welfare Tampere Finland
4. Faculty of Social Sciences Health Sciences Tampere University Tampere Finland
5. Department of Pediatrics Kuopio University Hospital Kuopio Finland
6. PEDEGO research group University of Oulu Oulu Finland