. 2017 Aug 14;19(8):e198. doi: 10.2196/jmir.6651
©Dave Parsons, Reinie Cordier, Sharmila Vaz, Hoe C Lee. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 14.08.2017.
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Figure 1.
Preferred reporting items for systematic reviews and meta-analyses (PRISMA) flow diagram.