Bah humbug! Association between sending Christmas cards to trial participants and trial retention : randomised study within a trial conducted simultaneously across eight host trials
Date
2021-12-14
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Citation
Coleman, E, Arundel, C, Clark, L, Doherty, L, Gillies, K, Hewitt, C A, Innes, K, Parker, A, Torgerson, D & Treweek, S 2021, 'Bah humbug! Association between sending Christmas cards to trial participants and trial retention : randomised study within a trial conducted simultaneously across eight host trials', BMJ, vol. 375, e067742. https://doi.org/10.1136/bmj-2021-067742