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From Gubler, Duane J. “Dengue, Urbanization and Globalization: The Unholy Trinity of the 21st Century.” Tropical Medicine and Health 39.4 Suppl (2011): 3–11.PMC. Web. 4 Apr. 2016. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3317603/figure/F3/.
