@article{Ali2010,
author = {Ali, M. and Cleland, J.},
title= {Contraceptive switching after method-related discontinuation: Levels and differentials},
year = {2010},
doi = {10.1111/j.1728-4465.2010.00234.x},
volume = {41},
number = {2},
pages = {129--133},
}