A randomised controlled trial to determine the effect on response of including a lottery incentive in health surveys [ISRCTN32203485]
<p>Abstract</p> <p>Background</p> <p>Postal questionnaires are an economical and simple method of data collection for research purposes but are subject to non-response bias. Several studies have explored the effect of monetary and non-monetary incentives on response. Re...
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BMC,
2004-11-01T00:00:00Z.
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