TY  - JOUR
A1  - Ventura, S.J.
A1  - Curtin, S.C.
A1  - Abma, J.C.
A1  - Henshaw, S.K.
T1  - Estimated pregnancy rates and rates of pregnancy outcomes for the United States, 1990-2008
Y1  - 2012
JF  - National Vital Statistics Reports
VL  - 60
IS  - 7
SP  - 1
EP  - -21

ER  -