Affiliation: | 1. Institute of Respiratory Medicine, Royal Prince Alfred Hospital, Sydney, Australia;2. Laakso Hospital, Helsinki, Finland;3. Central Hospital of Norrbotten, Lulea-Boden, Sweden;4. Glaxo Wellcome Research & Development Ltd, Uxbridge, U.K.;1. Department of Paediatrics, The Royal Berkshire Hospital, London Road, Reading, RG1 5AN, UK;2. Department of Paediatrics, The John Radcliffe Hospital, Oxford, Oxfordshire, UK |