. 2021 Feb 4;8(1):e21107. doi: 10.2196/21107
©Lena Elgert, Bianca Steiner, Birgit Saalfeld, Michael Marschollek, Klaus-Hendrik Wolf. Originally published in JMIR Rehabilitation and Assistive Technology (http://rehab.jmir.org), 04.02.2021.
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Figure 1.
PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analysis) flow diagram.