title: Letter: Direct-contact clusters of acute lymphatic leukaemia.
mesh_terms: D000293:Adolescent; D000328:Adult; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007494:Ireland; D007945:Leukemia, Lymphoid / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology; D008297:Male; D008875:Middle Aged; D012423:Rural Health; D014777:Virus Diseases / Q000150:complications