Anti-microbial immunity is impaired in COPD patients with frequent exacerbations - Singanayagam, A; Loo, S-L; Calderazzo, M; Finney, LJ; Trujillo, Torralbo M-B; Bakhsoliani, E; Girkin, J; Veerati, P; Pathinayake, PS; Nichol, KS; Reid, A; Foottit, J; et al. (2019)