. 2018 Mar 22;20(3):e106. doi: 10.2196/jmir.8701
©Susan M Schembre, Yue Liao, Michael C Robertson, Genevieve Fridlund Dunton, Jacqueline Kerr, Meghan E Haffey, Taylor Burnett, Karen Basen-Engquist, Rachel S Hicklen. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 22.03.2018.
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Figure 1.
Preferred Reporting of Systematic Reviews and Meta-Analyses (PRISMA) diagram.