. 2011 Nov 15;13(4):e93. doi: 10.2196/jmir.1678
©Hsiu-Hsin Tsai, Yun-Fang Tsai. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 15.11.2011.
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Figure 1.
Attrition of participants in the two groups over the 1-year study period.