BibTex format
@article{Key:2009:aje/kwn302,
author = {Key, J and Best, N and Joffe, M and Jensen, TK and Keiding, N},
doi = {aje/kwn302},
journal = {AMERICAN JOURNAL OF EPIDEMIOLOGY},
pages = {285--293},
title = {Methodological Issues in Analyzing Time Trends in Biologic Fertility: Protection Bias},
url = {http://dx.doi.org/10.1093/aje/kwn302},
volume = {169},
year = {2009}
}