@article{Pickett2003,
author = {Pickett, K.E. and Wakschlag, L.S. and Dai, L. and Leventhal, B.L. },
title= {Fluctuations of maternal smoking during pregnancy},
year = {2003},
journal = {Obstetrics and Gynecology },
volume = {101},
number = {1},
pages = {140147},
}