. 2016 Jun 27;18(6):e152. doi: 10.2196/jmir.5642
©Anke Versluis, Bart Verkuil, Philip Spinhoven, Melanie M van der Ploeg, Jos F Brosschot. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 27.06.2016.
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Figure 1.
PRISMA flow diagram for study inclusion.