COVID-19(53) Patient(25) D-dimer(14) SARS-CoV-2(12) Blood(9) severity(9) with COVID-19(9) disease severity(8) Laboratory(8) COVID-19 patient(8) outcome(8) Coagulation(8) coronavirus disease(8) Factor(8) elevated(8) Analysis(7) performed(7) antibodies(7) progression(7) Platelet(7) plasma(7) severe COVID-19(7) Mortality(7) antibody(7) help(7) hemoglobin(6) COVID-19 infection(6) platelet activation(6) marker(6) groups(6)