3. Laboratory testing
Medical laboratory finding results, including the numbers of leucocytes, lymphocytes, monocytes, eosinophils, basophils, platelets, Alanine aminotransferase (ALT), aspartate aminotransferase (AST), serum creatine kinase (CK), serum lactic dehydrogenase (LDH), blood urea nitrogen (BUN), serum creatinine (Scr), cardiac troponin I, concentrations of D-dimer, C-reactive protein (CRP), procalcitonin (PCT), erythrocyte sedimentation rate (ESR), serum ferritin, cytokines (IL-2R, IL-6, IL-8, IL-10, TNF-α), immune function were collected for each patient from electronic medical records.