TY  - JOUR
A1  - Schoendorf, K.C.
A1  - Branum, A.M.
T1  - The use of United States vital statistics in perinatal and obstetric research
Y1  - 2006
DO  - 10.1016/j.ajog.2005.11.020
JF  - American Journal of Obstetrics and Gynecology
VL  - 194
IS  - 4

ER  -