PROS1 and COVID-19: In the Sputnik V-vaccinated group with no history of COVID-19 (absence of antibodies to SARS-CoV-2 N-protein, no report of SARS-CoV-2 positive molecular test) we included individuals who were vaccinated with two doses of Sputnik V (n = 31; median and IQR of time after the second dose of the vaccine was 91 days (56–122)).