@article{Gregson2002,
author = {Gregson, S. and Terceira, N. and Kakowa, M. and Mason, P.R. and Anderson, R.M. and Chandiwana, S.K. and Caraël, M.},
title= {Study of bias in antenatal clinic HIV-1 surveillance data in a high contraceptive prevalence population in sub-Saharan Africa},
year = {2002},
doi = {10.1097/00002030-200203080-00017},
journal = {AIDS},
volume = {16},
number = {4},
pages = {643--652},
}