Global influenza surveillance systems to detect the spread of influenza-negative influenza-like illness during the COVID-19 pandemic: Time series outlier analyses from 2015-2020. - Cobb, Natalie L.; Collier, Sigrid; Attia, Engi F.; Augusto, Orvalho; West, T. Eoin; Wagenaar, Bradley H. (PLoS Medicine, 2022)