The title is essentially clickbait... which doesn't negate the content.<p>I didn't go through and look at all of them, but here are 4 of the source studies which certainly didn't require any FOIA.
<a href="https://doi.org/10.1080/02772240701806501" rel="nofollow">https://doi.org/10.1080/02772240701806501</a>
<a href="https://doi.org/10.1080/15287394.2010.519317" rel="nofollow">https://doi.org/10.1080/15287394.2010.519317</a>
<a href="https://academic.oup.com/cid/article/54/12/1778/455098" rel="nofollow">https://academic.oup.com/cid/article/54/12/1778/455098</a>
<a href="https://www.ebiomedicine.com/article/S2352-3964(17)30046-4/abstract" rel="nofollow">https://www.ebiomedicine.com/article/S2352-3964(17)30046-4/a...</a>