Authors: Díaz-Beyá M, Labopin M, Maertens J, Alijurf M, Passweg J, Dietrich B, Schouten H, Socié G, Schaap N, Schwerdtfeger R, Volin L, Michallet M, Polge E, Sierra J, Mohty M, Esteve J, Nagler A, Acute Leukaemia Working Party (ALWP) of the European Society for Blood and Marrow Transplantation (EBMT)