@article{ref1,
title="Problems encountered in behavioral science research in epidemiological studies",
journal="American journal of public health",
year="1964",
author="Wardwell, WI and Bahnson, CB",
volume="54",
number="",
pages="972-981",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}