1. Imperial College London; Allergy and Infectious Diseases, Section of Paediatrics, Division of Infectious Diseases, Department of Medicine; Wright Fleming Building Norfolk Place London UK W2 1PG
2. Imperial College London; Department of Paediatrics, Paediatric Allergy; 2nd floor Wright-Fleming Building Norfolk Place London UK W2 1PG
3. University of Liverpool; Liverpool Reviews and Implementation Group; Sherrington Building Ashton Street Liverpool UK L69 3GE
4. The University of Notre Dame Australia; Institute for Health Research; 19 Mouat Street PO Box 1125 Fremantle WA Australia 6959
5. The University of Nottingham; c/o Cochrane Skin Group; Room A103, King's Meadow Campus Lenton Lane Nottingham UK NG7 2NR
6. University Medical Center Groningen, University of Groningen; Department of Allergology, Groningen Research Institute for Asthma and COPD (GRIAC); Groningen Netherlands