M. H. Mohamed Chairi, F. J. Huertas Peña, M. S. Zurbano, T. T. Alcalá, and J. M. V. del Moral, “Treatment of perianal fistulae in crohn’s disease with mesenchymal stem cells”, Ann Clin Gastroenterol Hepatol, vol. 6, no. 1, pp. 006–020, May 2022.