1. Allergy Unit; 2nd Pediatric Clinic; University of Athens; Athens Greece
2. Division of Allergy; Pediatric Hospital Bambino Gesù; Rome Italy
3. Institute of Social Medicine, Epidemiology and Health Economics; Charité - Universitätsmedizin Berlin; Berlin Germany
4. Clinical and Experimental Sciences Academic Units; Faculty of Medicine; University of Southampton; Southampton UK
5. Department of Allergy; Hospital La Paz Institute for Health Research; Madrid Spain
6. Department of Immunology; Landspitali - The National University Hospital of Iceland; Reykjavik Iceland
7. Children's Hospital; Landspitali - The National University Hospital of Iceland; Reykjavik Iceland
8. Centre for Paediatrics and Child Health; Institute of Human Development; University of Manchester; Manchester UK
9. Institute of Food Research; Norwich Research Park; Colney Norwich UK
10. Department of Pediatric Respiratory Medicine and Allergy; Emma Children's Hospital; Academic Medical Center; Amsterdam The Netherlands
11. Vilnius University Faculty of Medicine; Vilnius Lithuania
12. Faculty of Health Sciences; Klaipeda University; Klaipeda Lithuania
13. Department of Immunology, Rheumatology and Allergy; Medical University of Lodz; Lodz Poland
14. Department of Pediatrics, Immunology and Nephrology; Polish Mother's Health Centre Research Institute Łódź; Lodz Poland
15. Neonatal Intensive Care Unit; Alexandra University Hospital; Athens Greece
16. Institute for Clinical Epidemiology and Biometry; University of Würzburg; Würzburg Germany
17. Department of Paediatric Pneumonology and Immunology; Charité - Universitätsmedizin Berlin; Berlin Germany