@article{ref1,
title="Research on environmental effects in genetic studies of aging: Comments",
journal="Journals of gerontology. Series B: psychological sciences and social sciences",
year="2005",
author="Crow, James F. and Johnson, T. E.",
volume="60 Spec No 1",
number="",
pages="7-11",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1079-5014",
doi="",
url="http://dx.doi.org/"
}