Abstract
References
1.National Center for Health Statistics (US) . Early release of selected estimates from the National Health Interview Survey [cited 2002 Feb 12]. Available from: URL: http://www.cdc.gov/nchs/about/major/nhis/released200202.htm
2.
Martin
J
Hamilton
B
Ventura
S
Menacker
F
Park
M
. Births: final data for 2000 . Natl Vital Stat Rep 2002 50 (5 ).