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Edwards, P., Roberts, I., Sandercock, P., & Frost, C. (2004). Follow-up by mail in clinical trials: does questionnaire length matter?. Controlled clinical trials, 25(1), 31-52.
Edwards, Phil, et al. "Follow-up by mail in clinical trials: does questionnaire length matter?." Controlled clinical trials 25.1 (2004): 31-52.
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P Edwards, I Roberts, P Sandercock, C Frost - Controlled clinical trials, 2004 - Elsevier

Follow-up by mail in clinical trials: does questionnaire length matter?.

Educational trials

Edwards, Roberts, Sandercock

GSID: 6bFyiK-mH24J

Excerpt

… for large clinical trials, we conducted a systematic review and meta-analysis of randomized controlled trials evaluating the effect of … The questionnaires included in the review covered a range of topics, including medical, educational and commercial subjects. Whether …

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