IgG4 serum levels are not elevated in cases of Post-COVID syndrome https://www.biorxiv.org/content/10.1101/2023.03.01.530454v1?med=mas
IgG4 serum levels are not elevated in cases of Post-COVID syndrome https://www.biorxiv.org/content/10.1101/2023.03.01.530454v1?med=mas