Childhood cancer in twins.
D002675:Child, Preschool; D004200:Diseases in Twins; D005260:Female; D006801:Humans; D007223:Infant; D007945:Leukemia, Lymphoid / Q000235:genetics*; D008297:Male; D009369:Neoplasms / Q000235:genetics*; D009396:Wilms Tumor / Q000235:genetics*