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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 229.606 Erythrokeratodermia Variabilis C17.800.229.800 Sweet Syndrome C17.800.257 ... C17.800.321.250 Foot Ulcer C17.800.321.500 Immersion Foot C17.800. ...