. 2012 Dec 17;14(6):e168. doi: 10.2196/jmir.2218
©Kirsikka Kaipainen, Collin R. Payne, Brian Wansink. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 17.12.2012.
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Figure 1.
Participant retention and follow-up survey completion rate.