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Correction to: Choosing the target difference and undertaking and reporting the sample size calculation for a randomised controlled trial – the development of the DELTA2 guidance

Crossref DOI link: https://doi.org/10.1186/s13063-019-3809-2

Published Online: 2019-10-24

Published Print: 2019-12

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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