Bah humbug! Sending Christmas Cards to trial participants does not increase retention: a randomised Study Within A Trial (SWAT), conducted simultaneously across eight host trials

Shaun Treweek* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Original languageEnglish
JournalBMJ
Publication statusAccepted/In press - 15 Nov 2021

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