CXCL9 and COVID-19: Guo et al. identified 11 cytokines with a predictive role in severe COVID-19 including granulocyte colony-stimulating factor (G-CSF), hepatocyte growth factor (HGF), IL-6, IL-7, IL-8, IL-10, IL-18, interferon gamma-induced protein 10 (IP-10), macrophage colony-stimulating factor (M-CSF), monokine induced by interferon-gamma (MIG) and stem cell growth factor-beta (SCGF-β) [37].