1. Department of Paediatrics, Faculty of Medicine Chinese University of Hong Kong Hong Kong China
2. Jockey Club School of Public Health and Primary Care Chinese University of Hong Kong Hong Kong China
3. Department of Chemical Pathology, Faculty of Medicine Chinese University of Hong Kong Hong Kong China
4. Department of Environmental and Biological Sciences University of Eastern Finland Kuopio Finland
5. Pediatric Allergology, Department of Pediatrics, Dr von Hauner Children's Hospital University Hospital, LMU Munich Munich Germany
6. Department of Allergy and Clinical Immunology, State Key Laboratory of Respiratory Disease The First Affiliated Hospital of Guangzhou Medical University Guangzhou China