F2 and pneumonia: Compared to the retrospective cohort of hospitalized patients with pneumonia and influenza, patients with COVID-19 had significantly higher values for lymphocyte count, platelet count, aspartate aminotransferase, albumin, lactate dehydrogenase, and ferritin, and lower values for white blood cell count, bilirubin, blood urea nitrogen, D-dimer, procalcitonin, creatinine, and prothrombin time.