The last study is a fascinating one because a big one of the "long term effects" of covid are described as "brain fog", which is basically a summary of the entire list of effects. And I'd make a bet that the study coming to the "brain fog" conclusion did not double-blind their study against people WITHOUT covid to compare/contrast how many of them were also "brain fogged". After all, they were seeking long-term effects of the illness, why search out and interview perfectly healthy people who've always been so? CLEARLY healthy people aren't being "brain fogged", so no need to test a baseline, because nothing significant changed in society during the 'rona restrictions, right?