That's literally the study this thread is talking about. It's great that they did it -- it should have been done in early 2020, all over the world. We should have dozens of other studies just like it.
The fact that we don't is an indication of how hard it's been to pursue any sort of science in this area. Almost nobody funds it, you can't get it published if it doesn't fit the public health narrative, and even if you do, the the news media won't report on it, and it might just get censored on social media.
That's a great point. Their study is a good starting point but it's hard to get anything concrete out of it. I hope they can continue with something like what you proposed.
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