Background Previous studies found associations between childhood leukemia and
surrogate indicators of exposure to magnetic fields (the power-line classification scheme
known as “wire coding “), but not between childhood leukemia and measurements of 60-Hz
residential magnetic fields. Methods We enrolled 638 children with acute lymphoblastic
leukemia (ALL) who were under 15 years of age and were registered with the Children's
Cancer Group and 620 controls in a study of residential exposure to magnetic fields …

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