Long-term Exposure to Air Pollution and Cardiovascular Mortality An Analysis of 22 European Cohorts - Beelen, R; Stafoggia, M; Raaschou-Nielsen, O; Andersen, ZJ; Xun, WW; Katsouyanni, K; Dimakopoulou, K; Brunekreef, B; Weinmayr, G; Hoffmann, B; Wolf, K; Samoli, E; et al. (EPIDEMIOLOGY, 2014)