title: Serum folate level before & after methotrexate administration & its relation to the toxic manifestations.
mesh_terms: D001215:Asparaginase / Q000627:therapeutic use; D005492:Folic Acid / Q000097:blood*; D006258:Head and Neck Neoplasms / Q000097:blood / Q000188:drug therapy; D006801:Humans; D002955:Leucovorin / Q000627:therapeutic use; D008727:Methotrexate / Q000009:adverse effects*
chemical_list: D005492:Folic Acid; D001215:Asparaginase; D002955:Leucovorin; D008727:Methotrexate