A Comparison of Small Monetary Incentives to Convert Survey Non-Respondents: A Randomized Control Trial

Griffin, J. M., Baines Simon, A., Hulbert, E., Grill, J. P., Noorbaloochi, S., & Partin, M. R. (2011). A Comparison of Small Monetary Incentives to Convert Survey Non-Respondents: A Randomized Control Trial. BMC Medical Research Methodology.