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. 2016 Jun 17;13(6):604. doi: 10.3390/ijerph13060604

Figure 1.

Figure 1

Flowchart of the selection of studies for inclusion in the meta-analysis Abbreviations: CNKI: Chinese National Knowledge Infrastructure; Vip: vip database; Wanfang: Wanfang data; and HCC: hepatocellular carcinoma.