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HIV and Syphilis Co-Infection Increasing among Men Who Have Sex with Men in China: A Systematic Review and Meta-Analysis

Figure 1

Flow chart showing the meta-analysis studies selection.

N; the number of articles included in systematic review; n, the number of prevalence estimates included in meta-analysis.

Figure 1

doi: https://doi.org/10.1371/journal.pone.0022768.g001