COVID-19(15) SARS-CoV-2(11) coronavirus(11) Coronavirus disease 2019(8) mechanism(8) ACE2(7) COVID‐19(6) receptor(5) expression(5) Serine(5) transmembrane(5) enzyme(5) angiotensin(5) host cells(5) acute respiratory syndrome(5) serine 2(5) TMPRSS2(5) protease(5) Epidemiology(4) transmembrane protease serine 2(4) Immunity(4) immune response(4) Candidates(3) coronavirus disease(3) domain(3) Biomarker(3) Future(3) severe acute respiratory syndrome Coronavirus(3) Clinical outcome(3) provide(3)