COVID-19(53) Patient(25) D-dimer(14) SARS-CoV-2(11) with COVID-19(9) Blood(9) coronavirus disease(8) outcome(8) Coagulation(8) disease severity(8) Factor(8) elevated(8) COVID-19 patient(8) Laboratory(8) antibody(7) plasma(7) severe COVID-19(7) severity(7) progression(7) help(7) performed(7) Mortality(7) Analysis(7) antibodies(7) Platelet(7) groups(6) COVID-19 infection(6) platelet activation(6) patients(6) COVID‐19(6)