S100A6 and COVID-19: ALT, alanine aminotransferase; AST, aspartate aminotransferase; BUN, blood urea nitrogen; COPD, chronic obstructive pulmonary disease; COVID-19, coronavirus disease 2019; ECMO; extracorporeal membrane oxygenation; HFNC, high-flow nasal cannula; INR, international normalized ratio; ME, morphine equivalent; PAH, pulmonary artery hypertension; PRA, panel reactive antibodies; WBC, white blood cell