. 2017 Nov 24;19(11):e394. doi: 10.2196/jmir.7997
©Bolin Cao, Somya Gupta, Jiangtao Wang, Lisa B Hightow-Weidman, Kathryn E Muessig, Weiming Tang, Stephen Pan, Razia Pendse, Joseph D. Tucker. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 24.11.2017.
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Figure 1.
PRISMA chart showing study selection process.