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PMC full text: | Published online 2019 Mar 20. doi: 10.1186/s12998-018-0231-x
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Fig. 1
![](./Figure_1_files/12998_2018_231_Fig1_HTML.jpg)
PRISMA flow diagram The flow diagram maps out the number of records identified from four databases,
the included and excluded studies, and the reasons for study exclusions