1. PEDEGO Research Unit, University of Oulu; Department of Internal Medicine, Oulu University Hospital; and Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Finland. mikyllon@student.oulu.fi
2. Department of General Practice and Primary Health Care, University of Helsinki, Finland.
3. Medical Research Center Oulu, Oulu University Hospital and University of Oulu; Center for Life Course Health Research, University of Oulu; and Department of Psychiatry, Oulu University Hospital, Finland.
4. Helsinki Rheumatic Diseases and Inflammation Research Group, University of Helsinki; and Terveystalo Healthcare, Lappeenranta, Finland.
5. PEDEGO Research Unit, University of Oulu; Medical Research Center, Oulu University Hospital and University of Oulu; and Department of Paediatrics, Oulu University Hospital, Finland.