@article{Johnson2010,
author = {Johnson, P.J. and Call, K.T. and Blewett, L.A.},
title= {The importance of geographic data aggregation in assessing disparities in American Indian prenatal care},
year = {2010},
doi = {10.2105/AJPH.2008.148908},
volume = {100},
number = {1},
pages = {122--128},
}