“Umbilical Cord Tissue-derived Mesenchymal Stem Cells Should be Considered as Adjuvant Therapy for COVID-19 Treatment: An Opinion from Pooled Clinical Evidence”, Biomed. Res. Ther., vol. 8, no. 9, pp. 4583–4595, Sep. 2021, doi: 10.15419/bmrat.v8i9.694.