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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... Esophagus C04.834.288 Erythroplasia C04.834.450 Keratosis, Actinic C04.834.512 Leukoplakia C04.834.512.513 ... 600 Papillon-Lefevre Disease C17.800.428.570 Keratosis, Actinic C17.800.428.580 Keratosis, Seborrheic C17.800. ...