Oulu University Hospital, Oulu, Finland
University of Turku and Turku University Hospital, Turku, Finland
University of Tampere and Tampere University Hospital, Tampere, Finland
Lund University and Skåne University Hospital, Malmö, Sweden
University of Oulu and Oulu University Hospital, Dept of Children and Adolescents, Oulu, Finland
University of Turku and Turku University Hospital, Turku, Finland
Lund University and Skåne University Hospital, Malmö, Sweden
University of Oulu, Center for Environmental and Respiratory Health Research, Oulu, Finland
PEDEGO Research Unit, University of Oulu and Oulu University Hospital, Oulu, Finland
Central Hospital Jyväskylä, Jyväskylä, Finland
Oulu Unversity Hospital, Oulu, Finland
Seinäjoki Central Hospital, Seinäjoki, Finland
University of Tampere and Tampere University Hospital, Tampere, Finland
University of Oulu and Oulu University Hospital, Oulu, Finland
University of Turku and Turku University Hospital, Turku, Finland
Emergency Room of Oulu University Hospital, Oulu, Finland
Pulmonology ward Oulu University Hospital, Oulu, Finland
University of Oulu; Oulu University Hospital, Oulu, Finland
Oulu University Hospital, Oulu, Finland