. 2014 Mar 7;16(3):e72. doi: 10.2196/jmir.2812
©Daniel Capurro, Matthias Ganzinger, Jose Perez-Lu, Petra Knaup. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 07.03.2014.
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Figure 1.
PRISMA flowchart of the systematic review.