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A comment on How Pulse Oximeters Work (2015). Parent comment
This article seems to be saying that it happens even when pneumonia isn't present:
https://www.sciencemag.org/news/2020/04/why-don-t-some-coron...
Unfortunately, the article is not as clear as I would hope, but that's how I read it at least.
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This article seems to be saying that it happens even when pneumonia isn't present:
https://www.sciencemag.org/news/2020/04/why-don-t-some-coron...
Unfortunately, the article is not as clear as I would hope, but that's how I read it at least.