1. Allergy and Lung Health Unit; Centre for Epidemiology and Biostatistics; Melbourne School of Population and Global Health; University of Melbourne; Melbourne Vic. Australia
2. Department of Family and Community Medicine; King Saud University; Riyadh Saudi Arabia
3. Institute of Epidemiology I; Helmholtz Zentrum München - German Research Center for Environmental Health; Neuherberg Germany
4. School of Public Health & Preventive Medicine; Monash University; Melbourne Vic. Australia
5. Murdoch Children's Research Institute; Department of Paediatrics; University of Melbourne; Royal Childrens' Hospital; Melbourne Vic. Australia
6. School of Psychology and Public Health; La Trobe University; Melbourne Vic. Australia
7. Marien-Hospital Wesel; Department of Pediatrics; Research Institute; Wesel Germany
8. Institute and Outpatient Clinic for Occupational, Social and Environmental Medicine Unit; Paediatric Environmental Epidemiology; WHO Collaboration Centre for Occupational Health; University Hospital Munich; Munich Germany