Impact of length or relevance of questionnaires on attrition in online trials: randomized controlled trial.

McCambridge, Jim; Kalaitzaki, Eleftheria; White, Ian R; Khadjesari, Zarnie; Murray, Elizabeth; Linke, Stuart; Thompson, Simon G; Godfrey, Christine; Wallace, Paul; (2011) Impact of length or relevance of questionnaires on attrition in online trials: randomized controlled trial. Journal of medical Internet research, 13 (4). e96-. ISSN 1439-4456 DOI: https://doi.org/10.2196/jmir.1733

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