COVID-19(23) Patient(13) SARS-CoV-2(13) coronavirus(12) acute respiratory syndrome(11) patients(10) Infection(10) disease(9) Coronavirus disease 2019(8) treated(8) Treatment(7) reported(7) antibody(7) demonstrated(6) severe acute respiratory syndrome Coronavirus(6) acute respiratory syndrome coronavirus(6) Hematological malignancy(6) death(6) Evidence(6) therapy(6) respiratory(6) effective(5) Steroids(5) ICU(5) severity(5) chronic lymphocytic leukemia(5) excluded(5) acute respiratory syndrome coronavirus 2(5) coronavirus disease(5) Tocilizumab(5)