LDH: lactate dehydrogenase, AST: aspartate aminotransferase, ALT: alanine aminotransferase, PT: prothrombin time, PTT: partial thromboplastin time, INR: international normalized ratio, ESR: erythrocyte sedimentation rate, C-RP: C-reactive protein, COVID-19: coronavirus disease 2019, IgG: immunoglobulin G, PCR: polymerase chain reaction. Here, F2 is linked to COVID-19.