@article{Hall2017,
author = {Hall, J.A. and Benton, L. and Copas, A. and Stephenson, J.},
title= {Pregnancy intention and pregnancy outcome: Systematic review and meta-analysis},
year = {2017},
doi = {10.1007/s10995-016-2237-0},
volume = {21},
number = {3},
pages = {670--704},
}