@article{Littlejohn2012,
author = {Littlejohn, K.E.},
title= {Hormonal contraceptive use and discontinuation because of dissatisfaction: Differences by race and education},
year = {2012},
doi = {10.1007/s13524-012-0127-7},
volume = {49},
number = {4},
pages = {1433--1452},
}