. 2015 Apr 28;4(2):e47. doi: 10.2196/resprot.3990
©Ghadah Alkhaldi, Fiona L Hamilton, Rosa Lau, Rosie Webster, Susan Michie, Elizabeth Murray. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 28.04.2015.
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Figure 1.
PRISMA flow diagram.