C Rizzari, MG Valsecchi, M Arico, R Miniero, C Messina, G De Rossi, AM Testi, R Mura, S Galimberti, A Biondi, F Locatelli, V Conter. Outcome of very late relapse in children with acute lymphoblastic leukemia. Haematologica 2004;89(4):427-434; https://doi.org/10.3324/%x.