@article{ref1,
title="Long working hours and problem drinking with special reference to employment grade [letter]",
journal="American journal of industrial medicine",
year="2020",
author="Kawada, Tomoyuki",
volume="63",
number="1",
pages="e99-e99",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0271-3586",
doi="10.1002/ajim.23058",
url="http://dx.doi.org/10.1002/ajim.23058"
}