[In vitro drug resistance as independent prognostic factor in the study COALL-O5-92 Treatment of childhood acute lymphoblastic leukemia; two-tiered classification of treatments based on accepted risk criteria and drug sensitivity profiles in study COALL-06-97]. - Janka-Schaub,G.E.; Harms,D.O.; den Boer,M.L.; Veerman,A.J.; Pieters,R. (Klin Pädiatr, 1999)