pcMSC Modulates Immune Dysregulation in Patients With COVID-19-Induced Refractory Acute Lung Injury. - Chen MC; Lai KS; Chien KL; Teng ST; Lin YR; Chao W; Lee MJ; Wei PL; Huang YH; Kuo HP; Weng CM; Chou CL (Frontiers in immunology, 2022)