@article{ref1,
title="Promoting walking and cycling as an alternative to using cars: vested interests doom puny healthcare interventions",
journal="British medical journal: BMJ",
year="2004",
author="Carnall, Douglas J.",
volume="329",
number="7476",
pages="1237; author reply 1238-1237; author reply 1238",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0959-8138",
doi="10.1136/bmj.329.7476.1237",
url="http://dx.doi.org/10.1136/bmj.329.7476.1237"
}