1. Section of Environmental Health and
2. Department of Epidemiology and Public Health, University College London, London, United Kingdom;
3. Section of Epidemiology, Department of Public Health, University of Copenhagen, Copenhagen, Denmark;
4. Denmark Statistic, Copenhagen, Denmark;
5. Department of Environmental Science and
6. iClimate, Interdisciplinary Centre for Climate Change, Aarhus University, Roskilde, Denmark; and
7. Global Centre for Clean Air Research, University of Surrey, Guildford, United Kingdom