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A comparison of small monetary incentives to convert survey non-respondents: a randomized control trial

Joan M Griffin*, Alisha Baines Simon, Erin Hulbert, John Stevenson, Joseph P Grill, Siamak Noorbaloochi and Melissa R Partin

BMC Medical Research Methodology 2011, 11:81  doi:10.1186/1471-2288-11-81

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