Title Item Type No Grouping Greenhall, G; Mansfield, KE; Nitsch, D; Iwagami, M; Leyrat, C; Johnston, R; Smeeth, L and Tomlinson, LA (2019). Codelists for: "The effect of initiation of renin-angiotensin system inhibitors on haemoglobin: a national cohort study". [Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. 10.17037/DATA.00001039.