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. 2021 Jun 20;367:104398. doi: 10.1016/j.cellimm.2021.104398

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Fig. 4 — Registered clinical trials investigating adoptive immunotherapies on COVID-19 patients (Up to March 31, 2021; n = 136). a, Frequency distribution of trials in geographical regions based on the cellular product. b, Frequency distribution of trials based on the country. c, Frequency distribution of trials based on the cellular product.