U.S. National Center for Health Statistics;
National Vital Statistics Reports (NVSR),
Volume 55, Number 1, September 29, 2006; Volume 55, Number 11, December 28, 2006; and prior reports.
For further information:
http://www.cdc.gov/nchs/products/pubs/pubd/nvsr/nvsr.htm
referenced on dataset section Notes (#2)
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