EBMT indicates European Group for Blood and Marrow Transplantation; ENR, Eurocord-Netcord Registry; NCBP, National Cord Blood Program; JMDP, Japan Marrow Donor Program; JCBBN, Japan Cord Blood Bank Network; GETH, Grupo Español de Trasplante Hematopoyético; PETHEMA, Programa Español de Tratamiento en Hematología; UMN, University of Minnesota; and PB, peripheral blood.