Clinical Study of Mesenchymal Stem Cell Treatment for Acute Respiratory Distress Syndrome Induced by Epidemic Influenza A (H7N9) Infection: A Hint for COVID-19 Treatment

•Menstrual blood-derived MSC transplantation lower mortality of H7N9-induced ARDS.•Prospective and systematic study of H7N9-induced pneumonia to assess health status.•MSC transplantation has not harmful effect in human body with long-term follow-up.•MSC-based therapy is an alternative way to treat COVID-19 in severe ARDS patient.