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. 2022 Feb 23;69(3):254–259. doi: 10.1097/MAT.0000000000001837

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Figure 1. — Histogram representing frequency of cannulations between April 1, 2020 and December 31, 2021. Wave 1 patients were cannulated between April and August 2020. Wave 2 (alpha wave) patients were cannulated between October 2020 and May 2021. Wave 3 (delta wave) patients were cannulated between August and December 2021.