Title Item Type No Grouping Davidson, J; Warren-Gash, C; Banerjee, A; McDonald, H and Smeeth, L (2021). Codelists for: "The effect of influenza vaccine on acute cardiovascular events in people with varying cardiovascular risk: a self-controlled case-series study in England, 2008-2019". [Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. 10.17037/DATA.00002675.