1. Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado 80523, USA;
2. ISGlobal, Centre for Research in Environmental Epidemiology (CREAL), Barcelona 08003, Spain;
3. Universitat Pompeu Fabra (UPF), Barcelona 08003, Spain
4. CIBER Epidemiología y Salud Pública (CIBERESP), Madrid 28029, Spain
5. Municipal Institute of Medical Research (IMIM), Hospital del Mar, Barcelona 08003, Spain
6. Center for Advancing Research in Transportation Emissions, Energy, and Health (CARTEEH), Texas A&M Transportation Institute (TTI), Texas 77843, USA;
7. Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98195, USA;