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

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). pp. 31-52. ISSN 0197-2456 DOI: https://doi.org/10.1016/j.cct.2003.08.013

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