1. Department of Pediatrics, Turku University Hospital, Turku, Finland.
2. Research Center for Integrative Physiology and Pharmacology, and Center for Population Health Research, Institute of Biomedicine, University of Turku, Turku, Finland.
3. Department of Biostatistics, University of Turku, Turku, Finland.
4. Pediatric Research Center, New Children's Hospital, Helsinki University Hospital, Helsinki, Finland.
5. Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, University of Helsinki, Helsinki, Finland.
6. Center for Child Health Research, Tampere University Hospital, Tampere, Finland.
7. Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland.
8. PEDEGO Research Unit, Department of Pediatrics, Medical Research Center, University of Oulu, Oulu, Finland.