Control selection using random digit dialing for cases of childhood cancer.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D009369:Neoplasms / Q000453:epidemiology*; D011897:Random Allocation; D012494:Sampling Studies; D012512:Sarcoma, Ewing / Q000453:epidemiology; D013689:Telephone; D014481:United States