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. 2022 Jul 26;17(7):e0271819. doi: 10.1371/journal.pone.0271819

Fig 2.

Fig 2

Comparison of clinical trial development metrics across the three time periods from 2008–2019 (A: Comparison of the mean number of participants enrolled in clinical trials from 2008–2019. B: Comparison of mean trial duration in months from 2009–2019).