Figure 1.

Map of China with NPC mortality indicated. The map shows the NPC mortality based on a nationwide investigation carried out from 1973–1976. Black areas indicate the regions with the highest mortality from NPC in southern China. Cangwu, Sihui, and Hong Kong are marked.

Jia et al. BMC Cancer 2006 6:178   doi:10.1186/1471-2407-6-178
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