Bah humbug! Association between sending Christmas cards to trial participants and trial retention: randomised study within a trial conducted simultaneously across eight host trials

Elizabeth Coleman, Catherine Arundel, Laura Clark, Laura Doherty, Katie Gillies, Catherine A Hewitt, Karen Innes, Adwoa Parker, David Torgerson, Shaun Treweek* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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