1. PEDEGO Research Unit; Medical Research Center Oulu and Department of Children and Adolescents; Oulu University Hospital and University of Oulu; Oulu Finland
2. Division of Neonatal Medicine; Department of Children and Adolescents; Oulu University Hospital; Oulu Finland
3. Division of Allergology and Pulmonology; Department of Children and Adolescents; Oulu University Hospital; Oulu Finland