Keywords: لوسمی حاد لنفوئیدی; ALL; acute lymphoid leukaemia; AML; acute myeloid leukaemia; RETI-SEHOP; Spanish Registry of Childhood Tumours; FC; Navteq cartography Functional Class; ORs; odds ratios; 95%CIs; 95% confidence intervals; IARC; International Agency for Research on Cancer;