F2R and myalgic encephalomeyelitis/chronic fatigue syndrome: The severity of cognitive symptoms correlated with AABs against F2R/PAR-1, CXCR3, and STAB1 in PCS/ME/CFS in contrast to our previous results in postinfectious non-COVID-19 ME/CFS in which cognitive impairment correlated with EDNRA and AGTR1 mediating vasoconstriction (CXCR3 and Stabilin-1 were not analyzed).