@article{ref1,
title="The importance of direct intervention",
journal="American journal of public health",
year="1977",
author="Bergner, L.",
volume="67",
number="12",
pages="1135-1136",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}