Systematic review of the addition of vincristine plus steroid pulses in maintenance treatment for childhood acute lymphoblastic leukaemia - an individual patient data meta-analysis... by Yetgin, S, Olcay, L, Dibar, E, Conter, V, Masera, G, Valsecchi, MG, Dacou-Voutetakis, C, Henze, I, Loening, L, Schrappe, M, von Stackelberg, A, Zimmermann, M, Attarbaschi, A, Gadner, H, Mann, G, Brandalise, SR, Carroll, W, Devidas, M, Gaynon, P, Hunger, S, Nachman, J, Janka, G, Stary, J, Gelber, R, Bierings, M