DOI:
10.1055/s-00000009
American Journal of Perinatology
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References
Martin JA, Hamilton BE, Osterman MJ. ; Centers for Disease Control and Prevention.
Three decades of twin births in the United States, 1980–2009.
Available at:
https://www.cdc.gov/nchs/products/databriefs/db80.htm . Accessed May 02, 2017
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