%T Recorded but not revealed: exploring the relationship between sex and gender, country income level, and COVID-19. %O Copyright © 2021 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC-ND 4.0 license. %C England %J The Lancet Global Health %A S Hawkes %A S Tanaka %A A Pantazis %A A Gautam %A S Kiwuwa-Muyingo %A K Buse %A A Purdie %D 2021 %L discovery10127715