Multinational cohort study of mortality in patients with asthma and severe asthma - Engelkes, M; de Ridder, M; Svensson, E; Berencsi, E; Prieto-Alhambra, D; Lapi, F; Giaquinto, C; Picelli, G; Boudiaf, N; Albers, F; Cockle, S; Bradford, E; et al. (Respiratory Medicine, 2020)