“Umbilical Cord Tissue-Derived Mesenchymal Stem Cells Should Be Considered As Adjuvant Therapy for COVID-19 Treatment: An Opinion from Pooled Clinical Evidence”. Biomedical Research and Therapy, vol. 8, no. 9, Sept. 2021, pp. 4583-95, https://doi.org/10.15419/bmrat.v8i9.694.