[url=http://www.eurekalert.org/pub_releases/2013-10/uom-rlw103013.php]link[/url]
Not really surprised to be honest.
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I don't really care one way or another in this gun debate, but just as a standard, if a study or its abstract doesn't list its sample size, it's probably a small sample size. The very minimum sample size you should have is about 100 people.