Smith, SamuelGreen, S.M.C.Brierley, ErinHall, Louise H.Collinson, M.Mason, E.Gillies, KatieFrench, DavidBartlett, KieraHartley, S.Foy, RFarrin, A. J.2022-03-162022-03-162022-01-31Smith, S, Green, S M C, Brierley, E, Hall, L H, Collinson, M, Mason, E, Gillies, K, French, D, Bartlett, K, Hartley, S, Foy, R & Farrin, A J 2022, 'Developing theory-based SMS messages to support retention in clinical trials : a mixed methods approach', Research Methods in Medicine & Health Sciences, vol. 3, no. 1, pp. 22-31. https://doi.org/10.1177/263208432110695302632-0843ORCID: /0000-0001-7890-2854/work/110275573https://hdl.handle.net/2164/18232The author(s) disclosed receipt of the following financial support for the research, authorship and/or publication of this article: This report is independent research supported by the National Institute for Health Research NIHR Advanced Fellowship, Dr Samuel Smith NIHR300588. The views expressed in this publication are those of the author(s) and not necessarily those of the NHS, the National Institute for Health Research or the Department of Health and Social Care. The funders had no role in the design of the study, data collection, analysis, interpretation of data and in the writing of this manuscript. Dr Smith also acknowledges the support of a Yorkshire Cancer Research Fellowship. Prof French is supported by the NIHR Manchester Biomedical Research Centre (IS-BRC1215-20007).10714492engSDG 3 - Good Health and Well-beingclinical trial retentionbehaviour change techniqueSMS text messagesstudies within trialsquestionnaire returnR MedicineNational Institute for Health Research (NIHR)NIHR300588IS-BRC1215-20007)RJournal article10.1177/2632084321106953031