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. 2000 Jan;54(1):71–72. doi: 10.1136/jech.54.1.71

The effect of a direct payment or a lottery on questionnaire response rates: a randomised controlled trial

P Roberts ¹, C Roberts ¹, B Sibbald ¹, D Torgerson ¹

PMCID: PMC1731530 PMID: 10692967

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