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Aggregation of Childhood Leukemia in Geographic Areas of GreeceEleni Petridou, Freda E. Alexander, Dimitrios Trichopoulos, Katharine Revinthi, Nick Dessypris, Naomi Wray, Stavros Haidas, Dimitrios Koliouskas, Helen Kosmidis, Fani Piperopoulou and Fotini Tzortzatou · Cancer Causes & Control · 1997