Haff N., Patel M. S., Lim R., Zhu J., Troxel A. B., Asch D. A., Volpp K. G. (2015).
"The role of behavioral economic incentive design and demographic characteristics
in financial incentive-based approaches to changing health behaviors: A meta-analysis.",
American Journal of Health Promotion, Vol. 29, No. 5, pp. 314-323