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Identifying additional studies for a systematic review of retention strategies in randomised controlled trials: making contact with trials units and trial methodologists

Crossref DOI link: https://doi.org/10.1186/s13643-017-0549-9

Published Online: 2017-08-22

Published Print: 2017-12

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

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