I've not read the paper, so I apologise if this is a totally uneducated guess - but earlier that was a lot of concern about blood clotting <1> and micro clots c

I've not read the paper, so I apologise if this is a totally uneducated guess - but earlier that was a lot of concern about blood clotting <1> and micro clots caused by covid, and also concern about changes to blood vessels <2> <1> https://www.ox.ac.uk/news/2023-09-01-blood-clots-during-covid-19-may-be-cause-ongoing-cognitive-problems https://www.ox.ac.uk/news/2023-09-01-blood-clots-during-covi... <2> https://www.tum.de/en/news-and-events/all-news/press-releases/details/new-approach-to-testing-for-long-covid https://www.tum.de/en/news-and-events/all-news/press-release...