@article{Colman2003,
author = {Colman, G.J. and Joyce, T. },
title= {Trends in smoking before, during, and after pregnancy in ten states},
year = {2003},
doi = {10.1016/S0749-3797(02)00574-3},
journal = {American Journal of Preventive Medicine },
volume = {24},
number = {1},
pages = {29--35},
}