1. Centre for Child Health Research, Tampere University, Tampere, Finland, and Tampere University Hospital, Tampere, Finland
2. Allergy Centre, Tampere University Hospital, Tampere, Finland
3. Faculty of Social Sciences, University of Tampere, Tampere, Finland
4. Emergency Division, Tampere University Hospital, Tampere, Finland
5. Department of Pediatrics, Seinäjoki University Hospital, Seinäjoki, Finland
6. The University Consortium of Seinäjoki, Seinäjoki, Finland