Correction: BMC Trials 23, 62 (2022)
https://doi.org/10.1186/s13063-021-05965-4
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Following publication of the original article [1], we have been informed that a supplementary file was missing. This is now referenced at the end of the Results section (“Select rankings of factors, motivations, and barriers influencing research participation and retention varied by site (Additional File 2)”.
The original article has been corrected.
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