Patient stratification based on prednisolone-vincristine-asparaginase resistance profiles in children with acute lymphoblastic leukemia. - Den Boer,ML.; Harms,DO.; Pieters,R.; Kazemier,KM.; Gobel,U.; Korholz,D.; Graubner,U.; Haas,RJ.; Jorch,N.; Spaar,HJ.; Kaspers,GJ.; Kamps,WA.; et al. (J Clin Oncol, 2003)