title: Leukemias in the Cracow region in the years 1961-1968.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D005260:Female; D006801:Humans; D007938:Leukemia / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D011044:Poland; D012424:Rural Population; D012737:Sex Factors; D014505:Urban Population