No abstract available
MeSH terms
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Child
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Child, Preschool
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Humans
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Infant
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Leukemia, Lymphoid / drug therapy*
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Lymphoma, Non-Hodgkin / drug therapy*
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Methotrexate / administration & dosage
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Methotrexate / adverse effects
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Methotrexate / metabolism
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Methotrexate / therapeutic use*
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Nervous System Diseases / etiology
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Osteosarcoma / drug therapy*