Citation: Phadnis R, Wickramasinghe C, Zevallos JC, et al. Leveraging mobile phone surveys during the COVID-19 pandemic in Ecuador and Sri Lanka: Methods, timeline and findings. PLoS One. 2021;16(4):e0250171. Published 2021 Apr 15. doi:10.1371/journal.pone.0250171
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- 05 Jan 2026
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