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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... Glioma C04.557.465.625.600.380.080 Astrocytoma C04.557.465.625.600.380.080.335 ... 380 Glioma C04.557.470.670.380.080 Astrocytoma C04.557.470.670.380.080.335 Glioblastoma ...
  2. Search Strategy Used to Create the PubMed Cancer Filter 
    https://www.nlm.nih.gov/bsd/pubmed_subsets/cancer_strategy.html
    ... tw] OR astroblastoma [tw] OR astroblastomas [tw] OR astrocytoma [tw] OR astrocytomas [tw] OR astroglioma [tw] OR ... Invest New Drugs [ta] OR J Adolesc Young Adult Oncol [ta] OR J Assoc Pediatr Oncol Nurses [ ...