DOI:
10.1055/s-00000169
American Journal of Perinatology Reports
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References
U.S. Department of Commerce.
American FactFinder - Results.
Factfindercensusgov. 2015 . Available at:
http://factfinder.census.gov/faces/tableservices/jsf/pages/productview.xhtml?src=bkmk . Accessed July 8, 2015
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