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. 2021 Jan 8;11:226. doi: 10.1038/s41598-020-80677-4

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© The Author(s) 2021

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Percent of respondents from high and low GDP countries (219 and 82 scientists, respectively) who knew different methods for avoiding biases and who erroneously thought that haphazard selection also helps to avoid biases. Asterisks indicate significant (P < 0.05) differences between high and low GDP countries (χ² test).