The part that needs more research is the level of difference between hospitalized and non-hospitalized COVID patients. They only had 15 who were hospitalized.
> Unlike in post hoc disease studies, the availability of pre-infection imaging data helps avoid ...
That depends on why the earlier brain scans were done.
edit - I didn't find discussion on the UK one, but an Australian study found those with some health concerns were more likely to accept the invitation. Not surprising.
He/she/it was informed about the banning, but didn't understand it (or missed the comment) and has kept posting for three years. (Mostly a string of the same, characteristic one-liner quips.)
> We identified significant effects of COVID-19 in the brain with a loss of grey matter in the left parahippocampal gyrus, the left lateral orbitofrontal cortex and the left insula. When looking over the entire cortical surface, these results extended to the anterior cingulate cortex, supramarginal gyrus and temporal pole. We further compared COVID-19 patients who had been hospitalised (n=15) with those who had not (n=379), and while results were not significant, we found comparatively similar findings to the COVID-19 vs control group comparison [...]