1. Department of Epidemiology and Biostatistics, Imperial College London, London, UK
2. Medical Research Council-Health Protection Agency Centre for Environment and Health, Imperial College London, London, UK
3. Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
4. Department of Population Health Sciences, University of Bristol, Bristol, UK
5. Division of Environmental Epidemiology, Institute for Risk Assessment Sciences (IRAS), Utrecht University, Utrecht, The Netherlands
6. INSERM, UMR1027, Université Toulouse III-Paul Sabatier, Toulouse, France
7. Epigenetics Group, International Agency for Research on Cancer (IARC), Lyon, France
8. NIHR-Health Protection Research Unit, Respiratory Infections and Immunity, Imperial College London, London, UK
9. MRC Integrative Epidemiology Unit, University of Bristol, Bristol, UK
10. IIGM, Italian Institute for Genomic Medicine, Turin, Italy