File:USA births by gestational age 1990-2006 graph.png
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Percent distribution of births by gestational age: United States, final 1990 and 2006
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current | 16:09, 19 July 2018 | 2,574 × 1,774 (417 KB) | Z8600021 (talk | contribs) | Percent distribution of births by gestational age: United States, final 1990 and 2006 |
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