The effect of a monetary incentive on return of a postal health and development questionnaire: a randomised trial [ISRCTN53994660]
<p>Abstract</p> <p>Background</p> <p>Postal questionnaires are widely used to collect data in healthcare research but a poor response rate may reduce the validity and reliability of results. There was a lack of evidence available relating to use of a monetary incentive...
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BMC,
2005-08-01T00:00:00Z.
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