DOI: 10.1055/s-00000009

American Journal of Perinatology

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Referenz

Martin JA, Hamilton BE, Sutton PD, Ventura SJ, Mathews TJ, Osterman MJ.
Births: final data for 2008.

Natl Vital Stat Rep 2010;
59 (1) 1 , 3–71. Available at:
http://www.cdc.gov/nchs/data/nvsr/nvsr59/nvsr59_01.pdf . Accessed June 22, 2012

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