Pérez-Simon JA, López-Villar O, Andreu EJ, Rifón J, Muntion S, Campelo MD, Sánchez-Guijo FM, Martinez C, Valcarcel D, del Cañizo C. Mesenchymal stem cells expanded in vitro with human serum for the treatment of acute and chronic graft-versus-host disease: results of a phase I/II clinical trial. Haematologica 2011; 96(7):1072-1076; https://doi.org/10.3324/haematol.2010.038356.