1. Department of Paediatrics and Adolescent Medicine Turku University Hospital and University of Turku, Lighthouse Hospital Turku Finland
2. Department of Allergology, Skin and Allergy Hospital University of Helsinki and Helsinki University Hospital Helsinki Finland
3. PEDEGO Research Unit, Medical Research Center University of Oulu Oulu Finland
4. Department of Paediatrics and Adolescent Medicine Oulu University Hospital Oulu Finland