1. Institute of Epidemiology and Medical Biometry; Ulm University; Ulm Germany
2. Institute of Epidemiology and Preventive Medicine; University of Regensburg; Regensburg Germany
3. Department of Allergy and Clinical Immunology; 424 General Military Training Hospital; Thessaloniki Greece
4. Murdoch Children's Research Institute; University of Melbourne; Melbourne VIC Australia
5. National Research Council of Italy; Institute of Biomedicine and Molecular Immunology; Palermo Italy
6. Children's Allergies Department; Division of Asthma, Allergy and Lung Biology; King's College London; London UK
7. Population Health Research Institute; St George's, University of London; London UK
8. Unit for Population-Based Dermatology Research; St John's Institute of Dermatology; King's College London and Guy's and St Thomas’ NHS Foundation; London UK