Late effects after Chemotherapy versus Allogeneic Stem Cell Transplantation in Childhood Relapsed Acute Lymphoblastic Leukemia – A report from the ALL-REZ BFM Study Group - Biesold, N; Meyr, F; Henze, G; Ranke, M; Beck, JD; Ebell, W; Klingebiel, T; Peters, C; Stackelberg, A von (Klinische Pädiatrie, 2012)