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- 18:56, 9 April 2010 S8600021 talk contribs uploaded File:USA change distribution births by gestational age.jpg (Percent change in the distribution of births by gestational age: United States, 1990 and 2006 SOURCE: CDC/NCHS, National Vital Statistics System. NOTE: Singleton births only. Martin JA, Hamilton BE, Sutton PD, Ventura SJ, et al. Births: Final data for )
