Secondary (up to 28 days): clinical status (days 7, 14, 21, and 28), time to hospital discharge or NEWS2 (National Early Warning Score 2) of ≤2 maintained for 24 hr, all cause mortality, duration (days) of mechanical ventilation, duration (days) of extracorporeal membrane oxygenation, duration (days) of supplemental oxygenation, length of hospital stay (days), time to 2019‐nCoV RT‐PCR, change (reduction) in 2019‐nCoV viral load in upper and lower respiratory tract specimens as assessed by area under viral load curve, frequency of serious adverse drug events, Serum TNF‐α, IL‐1β, IL‐2, IL‐6, IL‐7, IL‐10, GSCF, IP10#MCP1, MIP1α, and other cytokine expression levels before and after treatment