. 2016 Jun 22;18(6):e169. doi: 10.2196/jmir.4445
©Jennifer L Doty, Jessie H Rudi, Keri L M Pinna, Sheila K Hanson, Abigail H Gewirtz. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 22.06.2016.
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Figure 2.
Graph of 3 phases of incentives for online participation (n=370).