1. Department of Pediatrics; Central Hospital of Central Finland; Jyväskylä Finland
2. Department of Pediatrics; Kuopio University Hospital; Kuopio Finland
3. Department of Environmental and Biological Sciences; University of Eastern Finland; Kuopio Finland
4. Department of Health Protection; National Institute for Health and Welfare; Kuopio Finland
5. Department of Obstetrics and Gynecology; Kuopio University Hospital; Kuopio Finland
6. Institute of Clinical Medicine; School of Medicine; University of Eastern Finland; Kuopio Finland
7. Children's Hospital Schwarzach; Schwarzach Austria
8. Christine Kühne Center for Allergy Research and Education (CK-CARE); Davos Switzerland
9. Children's Hospital; University of Zürich; Zürich Switzerland
10. Department of Respiratory Disease; University of Besançon; UMR/CNRS 6249 Chrono-Environment; University Hospital; Besançon France
11. Department of Pediatrics; University of California; San Diego La Jolla CA USA
12. Children's Hospital of Eastern Switzerland; St. Gallen Switzerland
13. Institute of Epidemiology and Medical Biometry; Ulm University; Ulm Germany
14. Dr. von Hauner Children's Hospital; Ludwig Maximilians University Munich; Munich Germany
15. Institute for Laboratory Medicine, Pathobiochemistry and Molecular Diagnostics; Philipps University of Marburg; Marburg Germany
16. Member of the German Center for Lung Research; UGMLC Marburg Germany
17. Comprehensive Biomaterial Bank Marburg CBBM; Medical faculty; Philipps University of Marburg; Marburg Germany
18. Division of Experimental Asthma Research; Research Center Borstel; Leibniz-Center for Medicine and Biosciences; Member of the German Research Center for Lung Research; Borstel Germany
19. Institute for Experimental Medicine; Christian-Albrechts-Universitaet zu Kiel; Kiel Germany
20. Member of the German Center for Lung Research; CPC-M; Munich Germany
21. Department of Public Health; University of Helsinki; Helsinki Finland