title: Possible obstetric factors effecting leukemia in twins.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations; D004200:Diseases in Twins / Q000209:etiology*; D005260:Female; D005330:Fetofetal Transfusion / Q000150:complications; D005333:Fetus / Q000528:radiation effects; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007938:Leukemia / Q000209:etiology / Q000235:genetics*; D008431:Maternal-Fetal Exchange; D009362:Neoplasm Metastasis; D010920:Placenta / Q000098:blood supply; D011247:Pregnancy; D011830:Radiation Effects; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic