1. Department of Medicine, Centre for Pharmacoepidemiology; Karolinska Institutet; Stockholm Sweden
2. Department of Healthcare Development; Stockholm County Council, Public Healthcare Services Committee; Stockholm Sweden
3. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden
4. Lung and Allergy Unit; Astrid Lindgren Children's Hospital, Karolinska University Hospital; Stockholm Sweden
5. Institute of Environmental Medicine; Karolinska Institutet; Stockholm Sweden
6. Department of Clinical Science and Education, Södersjukhuset; Karolinska Institutet; Stockholm Sweden
7. Sachs' Children and Youth Hospital, Södersjukhuset; Stockholm Sweden