@article{Raatikainen2005,
author = {Raatikainen, K. and Heiskanen, N. and Heinonen, S.},
title= {Marriage still protects pregnancy},
year = {2005},
doi = {10.1111/j.1471-0528.2005.00667.x},
journal = {BJOG: An International Journal of Obstetrics and Gynaecology},
volume = {112},
number = {10},
pages = {1411--1416},
}