@article{Schoendorf2006,
author = {Schoendorf, K.C. and Branum, A.M.},
title= {The use of United States vital statistics in perinatal and obstetric research},
year = {2006},
doi = {10.1016/j.ajog.2005.11.020},
journal = {American Journal of Obstetrics and Gynecology},
volume = {194},
number = {4},
pages = {911--915},
}