. 2017 Apr 26;19(4):e134. doi: 10.2196/jmir.6747
©Peng Zhao, Illhoi Yoo, Jaie Lavoie, Beau James Lavoie, Eduardo Simoes. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 26.04.2017.
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Figure 1.
Logical relationships between the search keywords in the search builder of PubMed.