ECHO: context and limitations.

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Citation: Gollub EL, Stein Z, van de Wijgert JHHM, Jones H, Ralph L, Padian N. ECHO: context and limitations. Lancet. 2020 Feb 8;395(10222):e24. doi: 10.1016/S0140-6736(19)33108-3. PMID: 32035560.

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