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Nature 591, 512-513 (2021)
Updates & Corrections
Correction 23 March 2021: An earlier version of this story erroneously stated that the meta-analysis was published in The Lancet. The main text and reference list have been updated accordingly.
Chen, X. et al. Lancet Glob. Health https://doi.org/10.1016/S2214-109X(21)00026-7 (2021).