Figure 1.

Seropositivity of anti-HPV 16, 18, 6, 11, 16 or 18, 6 or 11, and any of four types in sexually active women (n = 4211), virgins (n = 520) and total women (n = 4731) from five geographic areas in China.

Ji et al. BMC Infectious Diseases 2012 12:137   doi:10.1186/1471-2334-12-137
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