. 2012 Mar 9;14(2):e45. doi: 10.2196/jmir.1922
©Rik Crutzen, Dianne Cyr, Nanne K. de Vries. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 09.03.2012.
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Figure 2.
Flowchart of study design and attrition.