Lanzoni, G., Linetsky, E., Correa, D., Messinger Cayetano, S., Alvarez, R. A., Kouroupis, D., Alvarez Gil, A., Poggioli, R., Ruiz, P., Marttos, A. C., Hirani, K., Bell, C. A., Kusack, H., Rafkin, L., Baidal, D., Pastewski, A., Gawri, K., Leñero, C., Mantero, A. M. A., Metalonis, S. W., Wang, X., Roque, L., Masters, B., Kenyon, N. S., Ginzburg, E., Xu, X., Tan, J., Caplan, A. I., Glassberg, M. K., Alejandro, R., & Ricordi, C. (2021). umbilical cord mesenchymal stem cells for COVID‐19 acute respiratory distress syndrome: A double‐blind, phase 1/2a, randomized controlled trial. Stem cells translational medicine, 10, 660–673. http://access.bl.uk/ark:/81055/vdc_100127488773.0x000005