Affiliation: | Department of Paediatrics, S:t Göran's Children's Hospital, Stockholm, Sweden;Department of Paediatrics, University Hospital, Umeå, Sweden;Department of Paediatrics, University Hospital, Linköping, Sweden;Department of Paediatrics, County Hospital, Eskilstuna, Sweden;Department of Paediatrics, University Hospital, Malmö, Sweden;Department of Paediatrics, County Hospital, Vänersborg, Sweden;Department of Paediatrics, University Hospital, Huddinge, Sweden;Department of Social Medicine, University of Umeå, Sweden |