Comparison of mucosal lining fluid sampling methods and influenza-specific IgA detection assays for use in human studies of influenza immunity - de, Silva TI; Gould, V; Mohammed, NI; Cope, A; Meijer, A; Zutt, I; Reimerink, J; Kampmann, B; Hoschler, K; Zambon, M; Tregoning, JS (Journal of Immunological Methods, 2017)