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. 2020 Nov 11;15(11):e0241825. doi: 10.1371/journal.pone.0241825

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Fig 1 — Flow diagram showing selection of VACO Index cohorts from 5,834,543 patients active in VA care as of January 1, 2020. All COVID-19 tests were performed in the VA. Patients with COVID-19 tests after July 18, 2020 did not have 30 days of follow-up and were excluded from the analysis.