. 2017 Aug 30;19(8):e301. doi: 10.2196/jmir.7814
©Daniel R Bateman, Bhavana Srinivas, Thomas W Emmett, Titus K Schleyer, Richard J Holden, Hugh C Hendrie, Christopher M Callahan. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 30.08.2017.
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Figure 1.
PRISMA flow diagram.