1. Imperial College London; Department of Medicine, Section of Paediatrics; St Mary's Campus London UK
2. Imperial College London; Imperial Clinical Trials Unit; 1st Floor, Stadium House 68 Wood Lane London UK W12 7RH
3. University of Nottingham; Centre of Evidence Based Dermatology; King's Meadow Campus Nottingham UK NG7 2NR
4. Oslo University Hospital; Division of Paediatric and Adolescent Medicine; Oslo Norway NO-0424
5. University of Oslo; Faculty of Medicine, Institute of Clinical Medicine; PO Box 4956 Nydalen Oslo Norway NO-0424
6. Oslo University Hospital; Department of Dermatology; Oslo Norway
7. University of Melbourne; Allergy and Lung Health Unit, Melbourne School of Population and Global Health; Melbourne Victoria Australia 3053
8. University of Wisconsin School of Medicine and Public Health; Department of Pediatrics; Madison Wisconsin USA
9. Graduate School of Medicine, Chiba University; Department of Pediatrics; 1-8-1 Inohana Chuo-Ku Chiba Japan 260-8670
10. Graduate School of Medicine, The University of Tokyo; Department of Midwifery and Women's Health; Tokyo Japan
11. National Center for Child Health and Development; Allergy Center; Tokyo Japan 157-8535
12. Keio University School of Medicine; Department of Pediatrics; Tokyo Japan
13. University Hospital Zurich; Department of Dermatology; Gloriastrasse 31 Zurich Switzerland 8091
14. University Hospital Basel; Department of Dermatology; Petersgraben 4 Basel Switzerland 4031
15. The University of Sheffield; Sheffield Dermatology Research, Department of Infection, Immunity & Cardiovascular Disease; Beech Hill Road Sheffield UK S10 2RX
16. The University of Manchester; Division of Nursing, Midwifery and Social Work, School of Health Sciences; Room 4.338, Jean McFarlane Building, Oxford Road Manchester UK M13 9PL
17. University of Sydney; NHMRC Clinical Trials Centre; Locked Bag 77 Camperdown NSW Australia 2050
18. Nottingham Health Science Partners; Nottingham Clinical Trials Unit; C Floor, South Block Queen's Medical Centre Nottingham UK NG7 2UH