1. Centre for Research in Environmental Epidemiology (CREAL), Barcelona, Spain
2. Universitat Pompeu Fabra (UPF), Barcelona, Spain
3. Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain
4. Centre for Environmental Policy, Imperial College London, London, UK
5. Arizona Respiratory Center, University of Arizona, Tucson, AZ, USA
6. Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, USA
7. Medical Faculty, Heinrich Heine University of Düsseldorf and IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany