1. PEDEGO Research Unit; University of Oulu; Oulu Finland
2. Medical Research Center, Oulu University Hospital; University of Oulu; Oulu Finland
3. Biocenter Oulu; University of Oulu; Oulu Finland
4. Department of Children and Adolescents; Oulu University Hospital; Oulu Finland
5. NordLab Oulu, Oulu University Hospital; University of Oulu; Oulu Finland
6. Department of Clinical Chemistry; University of Oulu; Oulu Finland
7. Department of Women's and Children's Health; Karolinska University Hospital Solna; Stockholm Sweden