1. Sachs' Children and Youth Hospital; Stockholm South General Hospital; Stockholm Sweden
2. Clinical Epidemiology Unit; Department of Medicine; Karolinska Institutet; Stockholm Sweden
3. Department of Clinical Science and Education Södersjukhuset; Karolinska Institutet; Stockholm Sweden
4. Institute of Environmental Medicine; Karolinska Institutet; Stockholm Sweden
5. Department of Women′s and Children′s Health; Uppsala University Hospital; Uppsala Sweden
6. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden
7. Department of Pediatrics; Örebro University Hospital; Örebro Sweden
8. Department of Clinical Science, Intervention and Technology; Division of Ear Nose and Throat Diseases; Karolinska Institutet; Stockholm Sweden
9. Department of Internal Medicine; Institute of Medicine; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
10. Centre for Person-Centered Care; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden