COVID-19(29) SARS-CoV-2(24) Patient(21) mechanism(15) patients(14) Treatment(13) coronavirus(12) reduce(11) COVID‐19(11) COVID-19 patient(10) immune response(10) contribute(9) ICU(9) COVID-19 patients(8) reported(8) Evidence(8) Cytokine storm(8) vaccination(8) expression(7) Cytokines(7) epidemiological(7) immune(7) Factor(7) eligible(7) disease(7) coronavirus disease(7) severity(7) median(7) New coronavirus(6) Coronavirus disease 2019(6)