COVID-19(67) thrombosis(48) Patient(29) thrombosis.(22) thrombotic(21) COVID-19 patient(21) Platelet(20) D-dimer(20) association(19) Mortality(19) platelet activation(19) COVID-19 patients(19) Coagulopathy(17) thrombocytopenia(16) coronavirus disease(15) Coronavirus disease 2019(15) Coagulation(14) median(14) Biomarker(14) COVID‐19(14) elevated(14) Antigen(14) reported(14) 95% CI(14) SARS-CoV-2(13) mechanism(13) marker(13) Platelets(13) AstraZeneca(12) Hospitalized(12)