National Institutes of Health. (n.d.). U.S. life expectancy. По данным сайтаhttp://www.nih.gov/about/impact/life_expectancy_graph.htm.
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Maternal and Child Health Bureau. (2013). Infant mortality. По данным сайтаhttp://mchb.hrsa.gov/chusa13/perinatal-health-status-indicators/p/infant-mortality.html.
