Smith, M. G., Witte, M., Rocha, S., & Basner, M. (2019). Effectiveness of incentives and follow-up on increasing survey response rates and participation in field studies. BMC Medical Research Methodology, 19, 230. https://doi.org/10.1186/s12874-019-0868-8
![white clouds above silhouette of clouds at day](https://s3.wp.wsu.edu/uploads/sites/192/2019/10/brady-bellini-_hpk_92Crhs-unsplash.jpg)