NCHS Dataline

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Bloom B Achinyta A Freeman G . Summary Health Statistics for U.S. Children, National Health Interview Survey, 2005. Vital and Health Statistics, Series 10, No. 231. Hyattsville, MD, October 2006.

Pleis J , Lethbridge-Cejku. Summary Health Statistics for U.S. Adults, National Health Interview Survey, 2004. Vital and Health Statistics, Series 10, No. 232. Hyattsville, MD, October 2006.

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