This sounded totally nuts when I heard two hospital staff talking about it to each other, so I went in search of some reasons...
Research articles referred to:
1) http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.609.694&rep=rep1&type=pdf
2) https://academic.oup.com/jcem/article/100/5/1792/2829636
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