@article{doi:10.1001/archinternmed.2011.2038,
author = {Wong K and Campitelli MA and Stukel TA and Kwong JC},
title = {EStimating influenza vaccine effectiveness in community-dwelling elderly patients using the instrumental variable analysis method},
journal = {Archives of Internal Medicine},
volume = {172},
number = {6},
pages = {484-491},
year = {2012},
doi = {10.1001/archinternmed.2011.2038},
URL = { + http://dx.doi.org/10.1001/archinternmed.2011.2038},
eprint = {/data/Journals/INTEMED/22611/ioi110023_484_491.pdf}
}