. 2017 Oct 19;5(10):e159. doi: 10.2196/mhealth.8671
©Bryn Dougherty, Sherif M Badawy. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 19.10.2017.
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Figure 1.
Flow of studies according to PRISMA guidelines.