Impact of acute GvHD severity on survival and disease relapse in pediatric patients undergoing allogeneic stem cell transplantation for acute lymphoblastic leukemia: an analysis based on the EBMT-PDWP registry. - Szmit Z; Lucchini G; Bertaina A; Galimard JE; Dalle JH; Locatelli F; Taskinen M; Mirci-Danicar O; Sedlacek P; Balduzzi A; Ghemlas I; Styczynski J; et al. (Bone marrow transplantation, 2026)