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- [1] A photograph of the researcher on the invitation letter did not affect the participation rate of a postal survey: a randomized study within a trial (SWAT)[J]. BMC MEDICAL RESEARCH METHODOLOGY, 2022, 22 (01)Prediger, BarbaraKoensgen, NadjaBora, Ana-MihaelaSchlimbach, AnnaPieper, Dawid
- [2] Format and readability of an enhanced invitation letter did not affect participation rates in a cancer registry-based study: a randomized controlled trial[J]. JOURNAL OF CLINICAL EPIDEMIOLOGY, 2013, 66 (01) : 85 - 94Hall, Alix E.Sanson-Fisher, Rob W.Lynagh, Marita C.Threlfall, TimothyD'Este, Catherine A.
- [3] Pen and Social Incentive Letter Retention Study within a Trial (SWAT) - An embedded, factorial design randomised controlled trial to investigate whether the inclusion of a pen and/or social incentive text cover letter included with the 12-month postal questionnaire improved response rates[J]. TRIALS, 2019, 20James, SophieParker, AdwoaTorgerson, David